Get merchant profile

{  "message": "merchant profile fetched",  "response": {    "merchant": {      "id": "66c9b4b736d142b900000001",      "userId": "66c9b4b736d142b900000002",      "businessName": "Acme Store",      "email": "payments@acme.example",      "status": "active",      "accountNumber": "0123456789",      "accountName": "Acme Store",      "bankCode": "100033",      "bankName": "PALMPAY",      "webhookUrl": "https://acme.example/webhooks/importa",      "availableBalance": 125000,      "pendingBalance": 0,      "totalCollected": 350000,      "totalWithdrawn": 100000,      "createdAt": "2026-08-24T12:00:00.000Z",      "updatedAt": "2026-08-24T12:00:00.000Z"    },    "apiKeys": [      {        "name": "Production backend",        "keyPrefix": "imp_live_",        "createdAt": "2026-08-24T12:00:00.000Z"      }    ]  }}