(PureBasic) PayPal - Create a PayPal Payment

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Creates a payment to be paid from a PayPal account (as opposed to being funded by a credit card).

Note: This example requires Chilkat v9.5.0.65 or greater.

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkStringBuilder.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkRest.pb"

Procedure ChilkatExample()

    ; Note: Requires Chilkat v9.5.0.65 or greater.

    ; This requires the Chilkat API to have been previously unlocked.
    ; See Global Unlock Sample for sample code.

    ; Load our previously obtained access token. (see PayPal OAuth2 Access Token)
    jsonToken.i = CkJsonObject::ckCreate()
    If jsonToken.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckLoadFile(jsonToken,"qa_data/tokens/paypal.json")

    ; Build the Authorization request header field value.
    sbAuth.i = CkStringBuilder::ckCreate()
    If sbAuth.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; token_type should be "Bearer"
    CkStringBuilder::ckAppend(sbAuth,CkJsonObject::ckStringOf(jsonToken,"token_type"))
    CkStringBuilder::ckAppend(sbAuth," ")
    CkStringBuilder::ckAppend(sbAuth,CkJsonObject::ckStringOf(jsonToken,"access_token"))

    ; Make the initial connection.
    ; A single REST object, once connected, can be used for many PayPal REST API calls.
    ; The auto-reconnect indicates that if the already-established HTTPS connection is closed,
    ; then it will be automatically re-established as needed.
    rest.i = CkRest::ckCreate()
    If rest.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    bAutoReconnect.i = 1
    success.i = CkRest::ckConnect(rest,"api.sandbox.paypal.com",443,1,bAutoReconnect)
    If success <> 1
        Debug CkRest::ckLastErrorText(rest)
        CkJsonObject::ckDispose(jsonToken)
        CkStringBuilder::ckDispose(sbAuth)
        CkRest::ckDispose(rest)
        ProcedureReturn
    EndIf

    ; ----------------------------------------------------------------------------------------------
    ; The code above this comment could be placed inside a function/subroutine within the application
    ; because the connection does not need to be made for every request.  Once the connection is made
    ; the app may send many requests..
    ; ----------------------------------------------------------------------------------------------

    ; Build the JSON containing the transaction information.
    json.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::setCkEmitCompact(json, 0)
    CkJsonObject::ckUpdateString(json,"intent","sale")
    CkJsonObject::ckUpdateString(json,"redirect_urls.return_url","http://www.example.com/return_url")
    CkJsonObject::ckUpdateString(json,"redirect_urls.cancel_url","http://www.example.com/cancel_url")
    CkJsonObject::ckUpdateString(json,"payer.payment_method","paypal")
    CkJsonObject::ckUpdateString(json,"transactions[0].amount.total","7.47")
    CkJsonObject::ckUpdateString(json,"transactions[0].amount.currency","USD")
    CkJsonObject::ckUpdateString(json,"transactions[0].description","This is the payment transaction description.")

    Debug CkJsonObject::ckEmit(json)

    ; The JSON created by the above code is this:

    ; 	{ 
    ; 	  "intent": "sale",
    ; 	  "redirect_urls": { 
    ; 	    "return_url": "http://www.example.com/return_url",
    ; 	    "cancel_url": "http://www.example.com/cancel_url"
    ; 	  },
    ; 	  "payer": { 
    ; 	    "payment_method": "paypal"
    ; 	  },
    ; 	  "transactions": [
    ; 	    { 
    ; 	      "amount": { 
    ; 	        "total": "7.47",
    ; 	        "currency": "USD"
    ; 	      },
    ; 	      "description": "This is the payment transaction description."
    ; 	    }
    ; 	  ]
    ; 	}

    CkRest::ckAddHeader(rest,"Authorization",CkStringBuilder::ckGetAsString(sbAuth))
    CkRest::ckAddHeader(rest,"Content-Type","application/json")

    ; Send the POST request containign the JSON in the request body, and get the JSON response.
    sbJsonRequest.i = CkStringBuilder::ckCreate()
    If sbJsonRequest.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::setCkEmitCompact(json, 1)
    CkJsonObject::ckEmitSb(json,sbJsonRequest)
    sbJsonResponse.i = CkStringBuilder::ckCreate()
    If sbJsonResponse.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkRest::ckFullRequestSb(rest,"POST","/v1/payments/payment",sbJsonRequest,sbJsonResponse)
    If success <> 1
        Debug CkRest::ckLastErrorText(rest)
        CkJsonObject::ckDispose(jsonToken)
        CkStringBuilder::ckDispose(sbAuth)
        CkRest::ckDispose(rest)
        CkJsonObject::ckDispose(json)
        CkStringBuilder::ckDispose(sbJsonRequest)
        CkStringBuilder::ckDispose(sbJsonResponse)
        ProcedureReturn
    EndIf

    CkJsonObject::setCkEmitCompact(json, 0)
    CkJsonObject::ckLoadSb(json,sbJsonResponse)

    Debug "Response Status Code = " + Str(CkRest::ckResponseStatusCode(rest))

    ; Did we get a 201 success response?
    If CkRest::ckResponseStatusCode(rest) <> 201
        Debug CkJsonObject::ckEmit(json)
        Debug "Failed."
        CkJsonObject::ckDispose(jsonToken)
        CkStringBuilder::ckDispose(sbAuth)
        CkRest::ckDispose(rest)
        CkJsonObject::ckDispose(json)
        CkStringBuilder::ckDispose(sbJsonRequest)
        CkStringBuilder::ckDispose(sbJsonResponse)
        ProcedureReturn
    EndIf

    ; Sample JSON response is shown below.
    Debug CkJsonObject::ckEmit(json)
    Debug "success"

    ; ------------------------------------------------
    ; A sample JSON response:

    ; 	{ 
    ; 	  "id": "PAY-1XK50350XV338620BLA3CZGI",
    ; 	  "intent": "sale",
    ; 	  "state": "created",
    ; 	  "payer": { 
    ; 	    "payment_method": "paypal",
    ; 	    "use_vendor_currency_conversion": false
    ; 	  },
    ; 	  "transactions": [
    ; 	    { 
    ; 	      "amount": { 
    ; 	        "total": "7.47",
    ; 	        "currency": "USD"
    ; 	      },
    ; 	      "description": "This is the payment transaction description.",
    ; 	      "related_resources": [
    ; 	      ]
    ; 	    }
    ; 	  ],
    ; 	  "create_time": "2016-11-23T23:56:09Z",
    ; 	  "links": [
    ; 	    { 
    ; 	      "href": "https://api.sandbox.paypal.com/v1/payments/payment/PAY-1XK50350XV338620BLA3CZGI",
    ; 	      "rel": "self",
    ; 	      "method": "GET"
    ; 	    },
    ; 	    { 
    ; 	      "href": "https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_express-checkout&token=EC-0BG932459F977083J",
    ; 	      "rel": "approval_url",
    ; 	      "method": "REDIRECT"
    ; 	    },
    ; 	    { 
    ; 	      "href": "https://api.sandbox.paypal.com/v1/payments/payment/PAY-1XK50350XV338620BLA3CZGI/execute",
    ; 	      "rel": "execute",
    ; 	      "method": "POST"
    ; 	    }
    ; 	  ]
    ; 	}


    CkJsonObject::ckDispose(jsonToken)
    CkStringBuilder::ckDispose(sbAuth)
    CkRest::ckDispose(rest)
    CkJsonObject::ckDispose(json)
    CkStringBuilder::ckDispose(sbJsonRequest)
    CkStringBuilder::ckDispose(sbJsonResponse)


    ProcedureReturn
EndProcedure