curl --request POST \
  --url https://uat-api.clinkbill.com/api/payment-instrument \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <api-key>' \
  --header 'X-Timestamp: <api-key>' \
  --data '
{
  "customerId": "cus_xxxxx",
  "paymentInstrumentType": "CASHAPP",
  "customerName": "Alice Example",
  "metadata": {
    "source": "checkout"
  }
}
'

{
  "code": 200,
  "msg": "success",
  "data": {
    "id": "<string>",
    "customerId": "<string>",
    "card": {
      "last4": "<string>",
      "name": "<string>",
      "expiryYear": "<string>",
      "expiryMonth": "<string>",
      "scheme": "<string>",
      "funding": "<string>",
      "issuerRegion": "<string>",
      "issuerBank": "<string>",
      "billingAddress": {
        "city": "<string>",
        "country": "<string>",
        "line1": "<string>",
        "line2": "<string>",
        "postalCode": "<string>",
        "state": "<string>"
      }
    },
    "wallet": {
      "accountTag": "<string>"
    },
    "created": 123
  }
}