curl -X POST "https://api.onekhusa.com/sandbox/v1/merchants/accounts/topup" \
  --header "Authorization: Bearer your-jwt-token" \
  --header "Content-Type: application/json" \
  --header "Accept-Language: en" \
  -d '{
    "merchantAccountNumber": 35253486,
    "connectorId": 550044,
    "topupAmount": 1000000.00,
    "createdBy": "johndoe@example.com"
  }'

{
  "beneficiary": {
    "accountNumber": 12346198,
    "accountName": "MERCHANT SANDBOX",
    "amountReceived": 49500,
    "currencyCode": "MWK"
  },
  "source": {
    "accountNumber": "5271306",
    "customerName": "ANGEL BAULENI",
    "amountSent": 50000,
    "currencyCode": "MWK",
    "sourceReferenceNumber": "JF260209114N",
    "connectorId": 212188,
    "connectorName": "National Bank of Malawi"
  },
  "transaction": {
    "transactionReferenceNumber": "CBPC73IQ5U2E",
    "transactionFee": 500,
    "transactionDescription": "Fake Merchant Account Topup",
    "transactionDate": "2026-02-09T15:12:52.8020476+02:00",
    "valueDate": "2026-02-09T15:12:52.8020476+02:00",
    "transactionCode": "BAM",
    "transactionTypeName": "Account To Merchant",
    "transactionStatusCode": "S",
    "transactionStatusName": "Success",
    "bridgeReferenceNumber": "019c4288-9342-7ebd-a947-6d97d4da77ed",
    "responseCode": "S100",
    "responseMessage": "Successful transaction"
  }
}