curl -X POST https://your-worker.workers.dev/api/keys \
  -H "Content-Type: application/json" \
  -d '{"label": "My App"}'

// Returns binary .pkpass — save directly to disk or send to user
const res = await fetch("https://your-worker.workers.dev/api/passes/receipt", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "X-API-Key": "wpk_your_key",
  },
  body: JSON.stringify({
    platform: "apple", // "apple" | "google" | "both"
    receipt: {
      orderId: "ORD-2025-001",
      merchantName: "Acme Coffee Co.",
      purchaseDate: "Jan 15, 2025",
      total: 24.99,
      currency: "USD",
      lineItems: [
        { description: "Oat Latte", quantity: 2, total: 12.00 },
        { description: "Croissant", quantity: 1, total: 4.50 },
      ],
      paymentMethod: "Visa",
      cardLast4: "4242",
      pointsEarned: 25,
      backgroundColor: "rgb(15, 23, 42)",
      foregroundColor: "rgb(255, 255, 255)",
    },
  }),
});

// Save the .pkpass file (iOS opens it → Add to Apple Wallet)
const blob = await res.blob();
const url = URL.createObjectURL(blob);
window.location.href = url; // triggers wallet sheet on iOS

const res = await fetch("/api/passes/bulk", {
  method: "POST",
  headers: { "X-API-Key": "wpk_...", "Content-Type": "application/json" },
  body: JSON.stringify({
    platform: "apple",
    receipts: [
      { orderId: "ORD-001", merchantName: "Acme", purchaseDate: "Jan 15, 2025", total: 24.99 },
      { orderId: "ORD-002", merchantName: "Acme", purchaseDate: "Jan 16, 2025", total: 18.50 },
    ],
  }),
});

// Response: { total, succeeded, failed, passes: [{orderId, base64, ...}] }
const { passes } = await res.json();
for (const pass of passes) {
  // pass.base64 is the .pkpass file encoded as base64
  downloadBase64Pass(pass.base64, `receipt-${pass.orderId}.pkpass`);
}

{
  "platform": "google",
  "saveUrl": "https://pay.google.com/gp/v/save/eyJhbGciOiJSUzI1NiJ9...",
  "token": "eyJhbGciOiJSUzI1NiJ9...",
  "objectId": "3388000000.receipt_ORD-001",
  "classId": "3388000000.receipt_v1"
}

// Redirect user to saveUrl to add to Google Wallet:
window.location.href = data.saveUrl;