purchase info derived

{
  "input": {
    "type": "http",
    "method": "GET",
    "queryParams": {}
  },
  "output": {
    "type": "json",
    "example": {
      "body": {
        "offerId": "ESIM-AT-1D-UNLIMITED-NOROAM"
      },
      "method": "POST",
      "payment": "x402 — exact USDC amount, fetched live per offerId",
      "endpoint": "POST /api/catalog/esims/purchase",
      "response": {
        "ok": true,
        "iccid": "8944422711118437246",
        "qrCode": "base64encodedpng",
        "status": "SUCCESS",
        "pollUrl": null,
        "qrCodeUrl": "data:image/png;base64,...",
        "transactionId": "zendit-uuid"
      },
      "workflow": [
        "1. GET /api/catalog/esims/offers to browse plans",
        "2. GET /api/catalog/esims/offers/:offerId for exact price",
        "3. POST /api/catalog/esims/purchase — x402 will return 402 with exact USDC amount, then pay and retry"
      ],
      "bodyParams": {
        "iccid": {
          "type": "string",
          "required": false,
          "description": "For top-up/recharge of existing eSIM only"
        },
        "offerId": {
          "type": "string",
          "required": true,
          "description": "eSIM offer ID from GET /esims/offers"
        }
      },
      "priceRange": "$4.00–$1,092 depending on plan — the browse price is the exact amount charged",
      "contentType": "application/json"
    }
  }
}