curl --request GET \
  --url https://api.sandbox.finsei.com/v2/payment/{id} \
  --header 'Authorization: Bearer <token>'

{
  "id": 0,
  "uuid": "string",
  "status": "new",
  "type": "string",
  "fee": {
    "amount": 0,
    "currencyId": "str"
  },
  "amount": 0,
  "total": 0,
  "counterparty": {
    "name": "string",
    "accountHolderName": "string",
    "bic": "string",
    "iban": "string"
  },
  "beneficiaryId": 0,
  "walletId": 0,
  "walletUuid": "string",
  "icon": "CONVERT",
  "entity": "PAYMENT",
  "currencyId": "str",
  "currencyExchangeId": 0,
  "currencyExchangeUuid": "string",
  "reference": "string",
  "transactionAmount": 0,
  "transactionCurrencyId": "str",
  "transactionExchangeRate": "string",
  "retrievalReferenceNumber": "string",
  "rejectReason": "string",
  "purposeCode": {
    "code": "string",
    "purpose": "string"
  },
  "operationType": "MAIN",
  "createdAt": 1666666666999,
  "updatedAt": 1666666666999,
  "completedAt": 1667404598000,
  "permissions": {
    "canCancel": true,
    "canSign": true,
    "canDelete": true,
    "canDownloadConfirmation": true
  },
  "currency": {
    "id": "string",
    "name": "str"
  },
  "currencyExchange": {
    "id": 0,
    "uuid": "string",
    "status": "NEW",
    "debitCurrencyId": "EUR",
    "creditCurrencyId": "USD",
    "debitAmount": 0,
    "creditAmount": 0,
    "fee": 0,
    "total": 0,
    "rate": 0,
    "createdAt": 1667404598,
    "createdAtMs": 1666666666999,
    "updatedAtMs": 1666666666999,
    "completedAt": 1667404598
  },
  "merchant": {
    "id": 0,
    "name": "string",
    "externalId": "string",
    "categoryCode": "stri",
    "categoryName": "string",
    "groupId": "string",
    "groupName": "string",
    "address": "string",
    "url": "https://ebay.com",
    "domain": "ebay.com",
    "phone": "0800 358 6551",
    "iconUrl": "https://ir.ebaystatic.com/pictures/aw/pics/announcements/new/logo/logo-inline.png"
  },
  "card": {
    "id": 0,
    "maskedNumber": "string"
  },
  "cardholder": {
    "id": 0,
    "name": "string",
    "channel": "VISA",
    "cardNumber": "string"
  },
  "files": [
    {
      "name": "5fb3ea0c68147.png",
      "type": "invoice",
      "url": "https://website.com/v1/payment/100/download/5fb3ea0c68147.pdf",
      "originalName": "test.jpg"
    }
  ]
}