feat(payment): Swish QR code and pre-filled payment link

Replace manual "type the number and order ID" flow with:
- Client-side QR code (qrcode npm package) for desktop users
- Pre-filled Swish payment URL (app.swish.nu) for mobile users
- Manual number fallback + "Jag har betalat" confirmation

The Swish C2B URL scheme pre-fills amount and message (order ID)
without requiring any Swish Commerce API certificate or bank agreement.

Supports both personal phone numbers (070...) and Swish Företag
business numbers (123...) via number normalization in buildSwishPaymentUrl().

Set SWISH_NUMBER in .env to a Företags number once set up.

.env.example

@@ -24,6 +24,12 @@ STRIPE_WEBHOOK_SECRET=whsec_...
 STRIPE_PRICE_ID=price_...
 
 # ---------- Swish (Phase 0) ----------
+# The Swish number customers pay to. Two formats accepted:
+#   - Swedish phone number: 0701234567 (normalised to 46… for the payment URL)
+#   - Swish Business number: 1234567890 (starts with 123, used as-is)
+# A Swish Business number (123…) is recommended — get one from your bank
+# via a "Swish Företag" agreement. No Swish Commerce API certificate needed;
+# the frontend generates a pre-filled QR code + payment link automatically.
 SWISH_NUMBER=0701234567
 
 # ---------- App URL (password reset links in email) ----------

frontend/e2e/payment-redirect.spec.ts

@@ -49,6 +49,31 @@ test.describe('Payment redirect', () => {
 
     await page.waitForURL(/\/betalning\//)
     await expect(page.getByText('Swisha till')).toBeVisible()
-    await expect(page.getByRole('button', { name: 'Jag har betalat' })).toBeVisible()
+    await expect(
+      page.getByRole('button', { name: 'Jag har betalat' }),
+    ).toBeVisible()
+  })
+
+  test('shows QR code for desktop scanning', async ({ page }) => {
+    await page.goto('/compose?plate=JKL012')
+    await page.getByLabel('Ditt meddelande').fill('Fin bil!')
+    await page.getByRole('button', { name: 'Fortsätt till betalning' }).click()
+
+    await page.waitForURL(/\/betalning\//)
+    await expect(page.getByRole('img', { name: 'Swish QR-kod' })).toBeVisible()
+    await expect(page.getByText('Skanna QR-koden')).toBeVisible()
+  })
+
+  test('shows Swish payment link with pre-filled data', async ({ page }) => {
+    await page.goto('/compose?plate=MNO345')
+    await page.getByLabel('Ditt meddelande').fill('Hej där!')
+    await page.getByRole('button', { name: 'Fortsätt till betalning' }).click()
+
+    await page.waitForURL(/\/betalning\//)
+    const swishLink = page.getByRole('link', { name: 'Betala med Swish' })
+    await expect(swishLink).toBeVisible()
+    const href = await swishLink.getAttribute('href')
+    expect(href).toContain('app.swish.nu')
+    expect(href).toContain('amt=49.00')
   })
 })

frontend/package-lock.json

@@ -9,6 +9,7 @@
       "version": "0.0.0",
       "dependencies": {
         "pinia": "^3.0.4",
+        "qrcode": "^1.5.4",
         "vue": "^3.5.32",
         "vue-router": "^5.0.6"
       },
@@ -16,6 +17,7 @@
         "@playwright/test": "^1.60.0",
         "@rushstack/eslint-patch": "^1.16.1",
         "@types/node": "^24.12.2",
+        "@types/qrcode": "^1.5.5",
         "@vitejs/plugin-vue": "^6.0.6",
         "@vitest/coverage-v8": "^4.1.6",
         "@vue/eslint-config-prettier": "^10.2.0",
@@ -791,9 +793,6 @@
         "arm64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -811,9 +810,6 @@
         "arm64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -831,9 +827,6 @@
         "ppc64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -851,9 +844,6 @@
         "s390x"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -871,9 +861,6 @@
         "x64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -891,9 +878,6 @@
         "x64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -1054,6 +1038,16 @@
         "undici-types": "~7.16.0"
       }
     },
+    "node_modules/@types/qrcode": {
+      "version": "1.5.6",
+      "resolved": "https://registry.npmjs.org/@types/qrcode/-/qrcode-1.5.6.tgz",
+      "integrity": "sha512-te7NQcV2BOvdj2b1hCAHzAoMNuj65kNBMz0KBaxM6c3VGBOhU0dURQKOtH8CFNI/dsKkwlv32p26qYQTWoB5bw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@typescript-eslint/eslint-plugin": {
       "version": "8.59.1",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.59.1.tgz",
@@ -1962,6 +1956,15 @@
         "node": ">=8"
       }
     },
+    "node_modules/camelcase": {
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
+      "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/chai": {
       "version": "6.2.2",
       "resolved": "https://registry.npmjs.org/chai/-/chai-6.2.2.tgz",
@@ -1987,11 +1990,91 @@
         "url": "https://paulmillr.com/funding/"
       }
     },
+    "node_modules/cliui": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-6.0.0.tgz",
+      "integrity": "sha512-t6wbgtoCXvAzst7QgXxJYqPt0usEfbgQdftEPbLL/cvv6HPE5VgvqCuAIDR0NgU52ds6rFwqrgakNLrHEjCbrQ==",
+      "license": "ISC",
+      "dependencies": {
+        "string-width": "^4.2.0",
+        "strip-ansi": "^6.0.0",
+        "wrap-ansi": "^6.2.0"
+      }
+    },
+    "node_modules/cliui/node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/cliui/node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+      "license": "MIT",
+      "dependencies": {
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/cliui/node_modules/emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+      "license": "MIT"
+    },
+    "node_modules/cliui/node_modules/string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/cliui/node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/cliui/node_modules/wrap-ansi": {
+      "version": "6.2.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-6.2.0.tgz",
+      "integrity": "sha512-r6lPcBGxZXlIcymEu7InxDMhdW0KDxpLgoFLcguasxCaJ/SOIZwINatK9KY/tf+ZrlywOKU0UDj3ATXUBfxJXA==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/color-convert": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
       "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
-      "dev": true,
       "license": "MIT",
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@@ -2004,7 +2087,6 @@
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-      "dev": true,
       "license": "MIT"
     },
     "node_modules/commander": {
@@ -2136,6 +2218,15 @@
         }
       }
     },
+    "node_modules/decamelize": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
+      "integrity": "sha512-z2S+W9X73hAUUki+N+9Za2lBlun89zigOyGrsax+KUQ6wKW4ZoWpEYBkGhQjwAjjDCkWxhY0VKEhk8wzY7F5cA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/decimal.js": {
       "version": "10.6.0",
       "resolved": "https://registry.npmjs.org/decimal.js/-/decimal.js-10.6.0.tgz",
@@ -2160,6 +2251,12 @@
         "node": ">=8"
       }
     },
+    "node_modules/dijkstrajs": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/dijkstrajs/-/dijkstrajs-1.0.3.tgz",
+      "integrity": "sha512-qiSlmBq9+BCdCA/L46dw8Uy93mloxsPSbwnm5yrKn2vMPiy8KyAskTF6zuV/j5BMsmOGZDPs7KjU+mjb670kfA==",
+      "license": "MIT"
+    },
     "node_modules/eastasianwidth": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/eastasianwidth/-/eastasianwidth-0.2.0.tgz",
@@ -2718,6 +2815,15 @@
         "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
       }
     },
+    "node_modules/get-caller-file": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
+      "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
+      "license": "ISC",
+      "engines": {
+        "node": "6.* || 8.* || >= 10.*"
+      }
+    },
     "node_modules/glob": {
       "version": "10.5.0",
       "resolved": "https://registry.npmjs.org/glob/-/glob-10.5.0.tgz",
@@ -2863,7 +2969,6 @@
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-      "dev": true,
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@@ -3285,9 +3390,6 @@
         "arm64"
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       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MPL-2.0",
       "optional": true,
       "os": [
@@ -3309,9 +3411,6 @@
         "arm64"
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       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MPL-2.0",
       "optional": true,
       "os": [
@@ -3333,9 +3432,6 @@
         "x64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MPL-2.0",
       "optional": true,
       "os": [
@@ -3357,9 +3453,6 @@
         "x64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MPL-2.0",
       "optional": true,
       "os": [
@@ -3743,6 +3836,15 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/p-try": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
+      "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/package-json-from-dist": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/package-json-from-dist/-/package-json-from-dist-1.0.1.tgz",
@@ -3787,7 +3889,6 @@
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-      "dev": true,
       "license": "MIT",
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         "node": ">=8"
@@ -3936,6 +4037,15 @@
         "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
       }
     },
+    "node_modules/pngjs": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-5.0.0.tgz",
+      "integrity": "sha512-40QW5YalBNfQo5yRYmiw7Yz6TKKVr3h6970B2YE+3fQpsWcrbj1PzJgxeJ19DRQjhMbKPIuMY8rFaXc8moolVw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.13.0"
+      }
+    },
     "node_modules/postcss": {
       "version": "8.5.13",
       "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.13.tgz",
@@ -4034,6 +4144,23 @@
         "node": ">=6"
       }
     },
+    "node_modules/qrcode": {
+      "version": "1.5.4",
+      "resolved": "https://registry.npmjs.org/qrcode/-/qrcode-1.5.4.tgz",
+      "integrity": "sha512-1ca71Zgiu6ORjHqFBDpnSMTR2ReToX4l1Au1VFLyVeBTFavzQnv5JxMFr3ukHVKpSrSA2MCk0lNJSykjUfz7Zg==",
+      "license": "MIT",
+      "dependencies": {
+        "dijkstrajs": "^1.0.1",
+        "pngjs": "^5.0.0",
+        "yargs": "^15.3.1"
+      },
+      "bin": {
+        "qrcode": "bin/qrcode"
+      },
+      "engines": {
+        "node": ">=10.13.0"
+      }
+    },
     "node_modules/quansync": {
       "version": "0.2.11",
       "resolved": "https://registry.npmjs.org/quansync/-/quansync-0.2.11.tgz",
@@ -4084,6 +4211,15 @@
         "url": "https://paulmillr.com/funding/"
       }
     },
+    "node_modules/require-directory": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
+      "integrity": "sha512-fGxEI7+wsG9xrvdjsrlmL22OMTTiHRwAMroiEeMgq8gzoLC/PQr7RsRDSTLUg/bZAZtF+TVIkHc6/4RIKrui+Q==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/require-from-string": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/require-from-string/-/require-from-string-2.0.2.tgz",
@@ -4094,6 +4230,12 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/require-main-filename": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-2.0.0.tgz",
+      "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==",
+      "license": "ISC"
+    },
     "node_modules/reusify": {
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       "resolved": "https://registry.npmjs.org/reusify/-/reusify-1.1.0.tgz",
@@ -4208,6 +4350,12 @@
         "node": ">=10"
       }
     },
+    "node_modules/set-blocking": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
+      "integrity": "sha512-KiKBS8AnWGEyLzofFfmvKwpdPzqiy16LvQfK3yv/fVH7Bj13/wl3JSR1J+rfgRE9q7xUJK4qvgS8raSOeLUehw==",
+      "license": "ISC"
+    },
     "node_modules/shebang-command": {
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@@ -5094,6 +5242,12 @@
         "node": ">= 8"
       }
     },
+    "node_modules/which-module": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.1.tgz",
+      "integrity": "sha512-iBdZ57RDvnOR9AGBhML2vFZf7h8vmBjhoaZqODJBFWHVtKkDmKuHai3cx5PgVMrX5YDNp27AofYbAwctSS+vhQ==",
+      "license": "ISC"
+    },
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       "version": "2.3.0",
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@@ -5236,6 +5390,12 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/y18n": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.3.tgz",
+      "integrity": "sha512-JKhqTOwSrqNA1NY5lSztJ1GrBiUodLMmIZuLiDaMRJ+itFd+ABVE8XBjOvIWL+rSqNDC74LCSFmlb/U4UZ4hJQ==",
+      "license": "ISC"
+    },
     "node_modules/yaml": {
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@@ -5251,6 +5411,134 @@
         "url": "https://github.com/sponsors/eemeli"
       }
     },
+    "node_modules/yargs": {
+      "version": "15.4.1",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-15.4.1.tgz",
+      "integrity": "sha512-aePbxDmcYW++PaqBsJ+HYUFwCdv4LVvdnhBy78E57PIor8/OVvhMrADFFEDh8DHDFRv/O9i3lPhsENjO7QX0+A==",
+      "license": "MIT",
+      "dependencies": {
+        "cliui": "^6.0.0",
+        "decamelize": "^1.2.0",
+        "find-up": "^4.1.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^4.2.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^18.1.2"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs-parser": {
+      "version": "18.1.3",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-18.1.3.tgz",
+      "integrity": "sha512-o50j0JeToy/4K6OZcaQmW6lyXXKhq7csREXcDwk2omFPJEwUNOVtJKvmDr9EI1fAJZUyZcRF7kxGBWmRXudrCQ==",
+      "license": "ISC",
+      "dependencies": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/yargs/node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs/node_modules/emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+      "license": "MIT"
+    },
+    "node_modules/yargs/node_modules/find-up": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/find-up/-/find-up-4.1.0.tgz",
+      "integrity": "sha512-PpOwAdQ/YlXQ2vj8a3h8IipDuYRi3wceVQQGYWxNINccq40Anw7BlsEXCMbt1Zt+OLA6Fq9suIpIWD0OsnISlw==",
+      "license": "MIT",
+      "dependencies": {
+        "locate-path": "^5.0.0",
+        "path-exists": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs/node_modules/locate-path": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-5.0.0.tgz",
+      "integrity": "sha512-t7hw9pI+WvuwNJXwk5zVHpyhIqzg2qTlklJOf0mVxGSbe3Fp2VieZcduNYjaLDoy6p9uGpQEGWG87WpMKlNq8g==",
+      "license": "MIT",
+      "dependencies": {
+        "p-locate": "^4.1.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs/node_modules/p-limit": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+      "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
+      "license": "MIT",
+      "dependencies": {
+        "p-try": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/yargs/node_modules/p-locate": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-4.1.0.tgz",
+      "integrity": "sha512-R79ZZ/0wAxKGu3oYMlz8jy/kbhsNrS7SKZ7PxEHBgJ5+F2mtFW2fK2cOtBh1cHYkQsbzFV7I+EoRKe6Yt0oK7A==",
+      "license": "MIT",
+      "dependencies": {
+        "p-limit": "^2.2.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs/node_modules/string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs/node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/yocto-queue": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",

frontend/package.json

@@ -17,6 +17,7 @@
   },
   "dependencies": {
     "pinia": "^3.0.4",
+    "qrcode": "^1.5.4",
     "vue": "^3.5.32",
     "vue-router": "^5.0.6"
   },
@@ -24,6 +25,7 @@
     "@playwright/test": "^1.60.0",
     "@rushstack/eslint-patch": "^1.16.1",
     "@types/node": "^24.12.2",
+    "@types/qrcode": "^1.5.5",
     "@vitejs/plugin-vue": "^6.0.6",
     "@vitest/coverage-v8": "^4.1.6",
     "@vue/eslint-config-prettier": "^10.2.0",

frontend/src/__tests__/PaymentRedirect.spec.ts

@@ -5,14 +5,26 @@ import { createRouter, createMemoryHistory } from 'vue-router'
 import PaymentRedirect from '@/pages/PaymentRedirect.vue'
 import OrdersPage from '@/pages/OrdersPage.vue'
 
+vi.mock('qrcode', () => ({
+  default: {
+    toDataURL: vi.fn().mockResolvedValue('data:image/png;base64,mock-qr'),
+  },
+}))
+
 vi.mock('@/api/payment', () => ({
   payOrder: vi.fn(),
   fetchSwishInfo: vi.fn(),
+  buildSwishPaymentUrl: vi.fn(
+    (number: string, amount: number, message: string) =>
+      `https://app.swish.nu/1/p/sw/?sw=${number}&amt=${amount.toFixed(2)}&msg=${message}`,
+  ),
 }))
 
 import { payOrder, fetchSwishInfo } from '@/api/payment'
+import QRCode from 'qrcode'
 const mockPayOrder = vi.mocked(payOrder)
 const mockFetchSwishInfo = vi.mocked(fetchSwishInfo)
+const mockToDataURL = vi.mocked(QRCode.toDataURL)
 
 function createTestRouter() {
   return createRouter({
@@ -59,6 +71,7 @@ describe('PaymentRedirect', () => {
       number: '0701234567',
       amount: 49,
     })
+    mockToDataURL.mockResolvedValue('data:image/png;base64,mock-qr')
   })
 
   it('renders heading and amount', async () => {
@@ -81,7 +94,7 @@ describe('PaymentRedirect', () => {
       expect(wrapper.text()).toContain('Beställnings-ID')
       expect(wrapper.text()).toContain(orderId)
       expect(wrapper.text()).toContain(
-        'Ange beställnings-ID ovan som meddelande i Swish-appen',
+        'fylls i automatiskt via QR-kod eller länk',
       )
     })
   })
@@ -93,13 +106,30 @@ describe('PaymentRedirect', () => {
     })
   })
 
+  it('renders QR code after fetching swish info', async () => {
+    const { wrapper } = await mountPage()
+    await vi.waitFor(() => {
+      expect(wrapper.find('.payment__qr-img').exists()).toBe(true)
+    })
+    expect(mockToDataURL).toHaveBeenCalledTimes(1)
+  })
+
+  it('renders a Swish payment link', async () => {
+    const { wrapper } = await mountPage('test-order', 'ABC123')
+    await vi.waitFor(() => {
+      const link = wrapper.find('.payment__swish-link')
+      expect(link.exists()).toBe(true)
+      expect(link.attributes('href')).toContain('app.swish.nu')
+    })
+  })
+
   it('shows confirmation dialog after clicking pay button', async () => {
     const { wrapper } = await mountPage()
     await vi.waitFor(() => {
-      expect(wrapper.find('.btn--primary').exists()).toBe(true)
+      expect(wrapper.find('.payment__submit').exists()).toBe(true)
     })
 
-    await wrapper.find('.btn--primary').trigger('click')
+    await wrapper.find('.payment__submit').trigger('click')
     await vi.waitFor(() => {
       expect(wrapper.text()).toContain('Jag bekräftar att jag har Swishat')
       expect(wrapper.text()).toContain('0701234567')
@@ -110,15 +140,15 @@ describe('PaymentRedirect', () => {
   it('can cancel confirmation dialog', async () => {
     const { wrapper } = await mountPage()
     await vi.waitFor(() => {
-      expect(wrapper.find('.btn--primary').exists()).toBe(true)
+      expect(wrapper.find('.payment__submit').exists()).toBe(true)
     })
 
-    await wrapper.find('.btn--primary').trigger('click')
+    await wrapper.find('.payment__submit').trigger('click')
     await vi.waitFor(() => {
       expect(wrapper.text()).toContain('Avbryt')
     })
 
-    await wrapper.find('.btn--ghost').trigger('click')
+    await wrapper.find('.payment__confirm-cancel').trigger('click')
     await vi.waitFor(() => {
       expect(wrapper.text()).toContain('Swisha till')
       expect(wrapper.text()).not.toContain('Avbryt')
@@ -137,16 +167,15 @@ describe('PaymentRedirect', () => {
 
     const { wrapper } = await mountPage()
     await vi.waitFor(() => {
-      expect(wrapper.find('.btn--primary').exists()).toBe(true)
+      expect(wrapper.find('.payment__submit').exists()).toBe(true)
     })
 
-    await wrapper.find('.btn--primary').trigger('click')
+    await wrapper.find('.payment__submit').trigger('click')
     await vi.waitFor(() => {
       expect(wrapper.text()).toContain('Ja, jag har betalat')
     })
 
-    const confirmButtons = wrapper.findAll('.btn--primary')
+    await wrapper.find('.payment__confirm .btn--primary').trigger('click')
-    await confirmButtons[confirmButtons.length - 1].trigger('click')
 
     expect(mockPayOrder).toHaveBeenCalledWith('order-1')
   })
@@ -156,16 +185,15 @@ describe('PaymentRedirect', () => {
 
     const { wrapper } = await mountPage()
     await vi.waitFor(() => {
-      expect(wrapper.find('.btn--primary').exists()).toBe(true)
+      expect(wrapper.find('.payment__submit').exists()).toBe(true)
     })
 
-    await wrapper.find('.btn--primary').trigger('click')
+    await wrapper.find('.payment__submit').trigger('click')
     await vi.waitFor(() => {
       expect(wrapper.text()).toContain('Ja, jag har betalat')
     })
 
-    const confirmButtons = wrapper.findAll('.btn--primary')
+    await wrapper.find('.payment__confirm .btn--primary').trigger('click')
-    await confirmButtons[confirmButtons.length - 1].trigger('click')
 
     await vi.waitFor(() => {
       expect(wrapper.text()).toContain('Kunde inte bekräfta betalningen')
@@ -184,16 +212,15 @@ describe('PaymentRedirect', () => {
 
     const { wrapper, router } = await mountPage()
     await vi.waitFor(() => {
-      expect(wrapper.find('.btn--primary').exists()).toBe(true)
+      expect(wrapper.find('.payment__submit').exists()).toBe(true)
     })
 
-    await wrapper.find('.btn--primary').trigger('click')
+    await wrapper.find('.payment__submit').trigger('click')
     await vi.waitFor(() => {
       expect(wrapper.text()).toContain('Ja, jag har betalat')
     })
 
-    const confirmButtons = wrapper.findAll('.btn--primary')
+    await wrapper.find('.payment__confirm .btn--primary').trigger('click')
-    await confirmButtons[confirmButtons.length - 1].trigger('click')
 
     await vi.waitFor(() => {
       expect(router.currentRoute.value.name).toBe('orders')

frontend/src/api/payment.ts

@@ -15,3 +15,44 @@ export function payOrder(orderId: string): Promise<Order> {
 export function fetchSwishInfo(): Promise<SwishInfo> {
   return request<SwishInfo>('/payment/swish-info')
 }
+
+/**
+ * Build a pre-filled Swish payment URL.
+ *
+ * On mobile, tapping this URL opens the Swish app with the amount and
+ * message pre-filled. On desktop, embed it in a QR code for the user
+ * to scan with their phone.
+ *
+ * Uses the Swish "C2B pre-fill" URL scheme documented at
+ * https://developer.swish.nu — no Swish Commerce API certificate required.
+ * The `sw` parameter accepts either a phone number or a Swish Business
+ * number (123…). Phone numbers in Swedish national format (leading 0)
+ * are normalised to international format (46…).
+ */
+export function buildSwishPaymentUrl(
+  swishNumber: string,
+  amount: number,
+  message: string,
+): string {
+  const payee = normalizeSwishNumber(swishNumber)
+  const params = new URLSearchParams({
+    sw: payee,
+    amt: amount.toFixed(2),
+    msg: message,
+  })
+  return `https://app.swish.nu/1/p/sw/?${params.toString()}`
+}
+
+/**
+ * Normalise a Swish number to the format the Swish URL expects.
+ * - 123… (Swish Business number) → unchanged
+ * - 46… (already international)  → unchanged
+ * - 0… (Swedish national format) → 46 + rest without leading 0
+ */
+function normalizeSwishNumber(number: string): string {
+  const trimmed = number.replace(/\s/g, '')
+  if (trimmed.startsWith('123')) return trimmed
+  if (trimmed.startsWith('46')) return trimmed
+  if (trimmed.startsWith('0')) return '46' + trimmed.slice(1)
+  return trimmed
+}

frontend/src/pages/PaymentRedirect.vue

@@ -1,7 +1,8 @@
 <script setup lang="ts">
-import { ref, onMounted } from 'vue'
+import { ref, computed, onMounted } from 'vue'
 import { useRouter, useRoute } from 'vue-router'
-import { payOrder, fetchSwishInfo } from '@/api/payment'
+import QRCode from 'qrcode'
+import { payOrder, fetchSwishInfo, buildSwishPaymentUrl } from '@/api/payment'
 import { isSessionExpired } from '@/api/client'
 
 const router = useRouter()
@@ -13,12 +14,27 @@ const swishAmount = ref(49)
 const paying = ref(false)
 const error = ref('')
 const showConfirmation = ref(false)
+const qrDataUrl = ref('')
+
+const swishPaymentUrl = computed(() =>
+  swishNumber.value
+    ? buildSwishPaymentUrl(swishNumber.value, swishAmount.value, orderId)
+    : '',
+)
 
 onMounted(async () => {
   try {
     const info = await fetchSwishInfo()
     swishNumber.value = info.number
     swishAmount.value = info.amount
+
+    if (swishPaymentUrl.value) {
+      qrDataUrl.value = await QRCode.toDataURL(swishPaymentUrl.value, {
+        width: 224,
+        margin: 2,
+        color: { dark: '#111827', light: '#ffffff' },
+      })
+    }
   } catch {
     error.value = 'Kunde inte ladda betalningsinformation. Försök igen senare.'
   }
@@ -78,21 +94,37 @@ async function confirmPayment() {
       </div>
 
       <template v-if="!showConfirmation">
+        <!-- QR code — scan with the Swish app (desktop users) -->
+        <div v-if="qrDataUrl" class="payment__qr">
+          <img :src="qrDataUrl" alt="Swish QR-kod" class="payment__qr-img" />
+          <p class="payment__qr-hint">
+            Skanna QR-koden med Swish-appen för att betala
+          </p>
+        </div>
+
+        <!-- Direct link — opens the Swish app (mobile users) -->
+        <a
+          v-if="swishPaymentUrl"
+          :href="swishPaymentUrl"
+          class="btn btn--primary btn--lg payment__swish-link"
+        >
+          Betala med Swish
+        </a>
+
+        <!-- Manual fallback -->
         <div class="payment__swish">
           <p class="payment__swish-label">Swisha till</p>
           <p class="payment__swish-number">{{ swishNumber }}</p>
           <p class="payment__swish-instruction">
-            Ange beställnings-ID ovan som meddelande i Swish-appen.
+            Belopp och beställnings-ID fylls i automatiskt via QR-kod eller
+            länk.
           </p>
           <p class="payment__swish-instruction">
-            Tryck sedan på knappen nedan för att bekräfta.
+            Betala manuellt om du inte har Swish-appen tillgänglig.
           </p>
         </div>
 
-        <button
+        <button class="btn btn--ghost payment__submit" @click="startPayment">
-          class="btn btn--primary btn--lg payment__submit"
-          @click="startPayment"
-        >
           Jag har betalat
         </button>
       </template>
@@ -201,6 +233,31 @@ async function confirmPayment() {
   color: var(--color-ink);
 }
 
+.payment__qr {
+  text-align: center;
+  margin-bottom: var(--space-lg);
+}
+
+.payment__qr-img {
+  width: 224px;
+  height: 224px;
+  border-radius: var(--radius-md);
+  margin: 0 auto var(--space-sm);
+}
+
+.payment__qr-hint {
+  font-size: 0.8125rem;
+  color: var(--color-muted);
+}
+
+.payment__swish-link {
+  display: block;
+  width: 100%;
+  text-align: center;
+  text-decoration: none;
+  margin-bottom: var(--space-lg);
+}
+
 .payment__swish {
   background: var(--color-border-light);
   border: 1px solid var(--color-border);