(Visual Basic 6.0) Paynow.pl -- Make a Payment Request

Make a payment request POST with prepared message on Paynow payment request endpoint.

For more information, see https://docs.paynow.pl/#section/Payments/Make-a-payment

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim http As New ChilkatHttp
Dim success As Long

' Implements the following CURL command:

' curl --request POST 'https://api.sandbox.paynow.pl/v1/payments' \
' -H 'Content-Type: application/json' \
' -H 'Api-Key: c12c386b-650b-43db-9430-d84fc05d9433' \
' -H 'Signature: aYPCytCoc+/wFgqHZJjgBCi20omXTn0yzm9LysJgnFo=' \
' -H 'Idempotency-Key: 59c6dd26-f905-487b-96c9-fd1d2bd76885' \
' --data-raw '{
'     "amount": 45671,
'     "externalId": "234567898654",
'     "description": "Test transaction",
'     "buyer": {
'         "email": "jan.kowalski@melements.pl"
'     }
' }'

' Use the following online tool to generate HTTP code from a CURL command
' Convert a cURL Command to HTTP Source Code

' Use this online tool to generate code from sample JSON:
' Generate Code to Create JSON

' The following JSON is sent in the request body.

' {
'   "amount": 45671,
'   "externalId": "234567898654",
'   "description": "Test transaction",
'   "buyer": {
'     "email": "jan.kowalski@melements.pl"
'   }
' }

Dim json As New ChilkatJsonObject
success = json.UpdateInt("amount",45671)
success = json.UpdateString("externalId","234567898654")
success = json.UpdateString("description","Test transaction")
success = json.UpdateString("buyer.email","jan.kowalski@melements.pl")

Dim myApiAccessKey As String
myApiAccessKey = "c12c386b-650b-43db-9430-d84fc05d9433"
Dim mySigCalcKey As String
mySigCalcKey = "b758f20d-ba92-44fa-acca-f57e99787b9d"

' Calculate the Signature header.
Dim crypt As New ChilkatCrypt2
crypt.MacAlgorithm = "hmac"
crypt.EncodingMode = "base64"
success = crypt.SetMacKeyString(mySigCalcKey)
crypt.HashAlgorithm = "SHA-256"
Dim messageBody As String
messageBody = json.Emit()
Dim signature As String
signature = crypt.MacStringENC(messageBody)

http.SetRequestHeader "Idempotency-Key",crypt.GenerateUuid()
http.SetRequestHeader "Api-Key",myApiAccessKey
http.SetRequestHeader "Signature",signature
http.SetRequestHeader "Content-Type","application/json"
http.Accept = "application/json"

Dim resp As ChilkatHttpResponse
Set resp = http.PostJson3("https://api.sandbox.paynow.pl/v1/payments","application/json",json)
If (http.LastMethodSuccess = 0) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

Debug.Print "Response body:"
Debug.Print resp.BodyStr

' Sample response:
' {
'   "redirectUrl": "https://paywall.sandbox.paynow.pl/NOA0-YJ9-Y1P-29V?token=eyJraWQiOiJhMD ... L60wk",
'   "paymentId": "NOA0-YJ9-Y1P-29V",
'   "status": "NEW"
' }

Dim jsonResp As New ChilkatJsonObject
success = jsonResp.Load(resp.BodyStr)
Dim redirectUrl As String
redirectUrl = json.StringOf("redirectUrl")
Dim paymentId As String
paymentId = json.StringOf("paymentId")
Dim status As String
status = json.StringOf("status")