curl --request POST \
  --url https://sandbox-api.kotanipay.io/api/v3/onramp \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "fiatAmount": 123,
  "currency": "eg NGN or GHS or KES",
  "receiverAddress": "<string>",
  "referenceId": "<string>",
  "callbackUrl": "<string>",
  "rateId": "<string>",
  "fiatWalletId": "<string>"
}
'

{
  "success": true,
  "message": "Request has been successfully created",
  "data": {
    "id": "<string>",
    "referenceId": "<string>",
    "referenceNumber": 123,
    "message": "<string>",
    "customerKey": "<string>",
    "redirectUrl": "<string>"
  }
}