curl --request GET \
  --url https://sandbox.api.fin.com/v2/transactions/pay-ins/{payin_id} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "728c95d3-8b1e-4497-b3da-f36bcc066d7d",
    "customer_id": "34c62166-3e7a-436b-a2e3-338c4148a859",
    "status": "PENDING",
    "transaction_id": null,
    "created_at": "2026-06-09T18:27:35.468309Z",
    "expire_at": "2026-06-10T18:27:35.437874Z",
    "source_amount": 100101,
    "source_amount_in_major": 1001.01,
    "currency": "MXN",
    "destination": {
      "address": "0xD2Ba7d0DaBd36498df5906fC7B054Fa9EfA9843E",
      "rail": "POLYGON",
      "currency": "USDC"
    },
    "fees": {
      "developer_fee": {
        "fixed": 0,
        "percentage": 0
      },
      "total_developer_fee": 0,
      "network_fee": 0,
      "conversion_fee": 0,
      "total_fee": 0
    },
    "destination_amount_in_major": 57.324182,
    "exchange_rate": 17.462264,
    "deposit_instruction": {
      "type": "BANK_DEPOSIT",
      "bank_details": {
        "bank_name": "FINCO PAY",
        "bank_address": null,
        "bank_address_details": null,
        "bank_routing_number": null,
        "bank_account_number": "734180000129991804",
        "payment_rails": [
          "SPEI"
        ],
        "bank_country": "MEX",
        "account_type": "centralizing",
        "bank_code": {
          "code": "734180000129991804",
          "type": "CLABE"
        },
        "reference": "88ff4abb99e39499db661e1c97f0770fb1fb05c3",
        "account_holder_name": "FIN BU1"
      },
      "checkout_details": null
    }
  }
}