Retrieve a customer

GET /api/v1/partner/customers/{customerId}

curl https://api.niftipay.com/api/v1/partner/customers/pc-1 \
  -H "Authorization: Bearer <partner_api_key>"

Response 200

{
  "request_id": "req-1",
  "api_version": "2026-08-01",
  "data": {
    "partner_customer_id": "pc-1",
    "customer_id": "user_abc",
    "external_customer_id": "cust_42",
    "relationship_status": "active",
    "created_at": "2026-08-01T00:00:00.000Z",
    "customer": {
      "email": "buyer@example.com",
      "name": null,
      "country": null,
      "created_at": null
    }
  }
}

404 not_found if the customer is not yours.