(Visual FoxPro) PayPal - Find Captures

Finds captures for previous authorizations. (A capture is when the funds from an authorization are captured. There can be more than one capture, where the sum adds to the full authorization amount or an amount lower than the authorized amount.)

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

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

LOCAL loJsonToken
LOCAL loSbAuth
LOCAL loRest
LOCAL lnBAutoReconnect
LOCAL lnSuccess
LOCAL loSbJsonResponse
LOCAL loJson
LOCAL loSbTemp
LOCAL lnNumPayments
LOCAL i
LOCAL j
LOCAL lnNumTransactions
LOCAL lnNumRelatedResources
LOCAL k
LOCAL loJsonCapture

* 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)
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonToken = CreateObject('Chilkat.JsonObject')
loJsonToken.LoadFile("qa_data/tokens/paypal.json")

* Build the Authorization request header field value.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbAuth = CreateObject('Chilkat.StringBuilder')
* token_type should be "Bearer"
loSbAuth.Append(loJsonToken.StringOf("token_type"))
loSbAuth.Append(" ")
loSbAuth.Append(loJsonToken.StringOf("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.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Rest')
loRest = CreateObject('Chilkat.Rest')
lnBAutoReconnect = 1
lnSuccess = loRest.Connect("api.sandbox.paypal.com",443,1,lnBAutoReconnect)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loJsonToken
    RELEASE loSbAuth
    RELEASE loRest
    CANCEL
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..
* ----------------------------------------------------------------------------------------------

* Clear the REST object of any headers or query params from previous requests.
loRest.ClearAllHeaders()
loRest.ClearAllQueryParams()

loRest.AddHeader("Authorization",loSbAuth.GetAsString())

* To find captured payments, we list payments and look for those
* containing a "capture" resource.
loRest.AddQueryParam("count","100")
loRest.AddQueryParam("start_index","0")
loRest.AddQueryParam("sort_by","update_time")
loRest.AddQueryParam("sort_order","asc")

* Send the GET request and get the JSON response.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbJsonResponse = CreateObject('Chilkat.StringBuilder')
lnSuccess = loRest.FullRequestNoBodySb("GET","/v1/payments/payment",loSbJsonResponse)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loJsonToken
    RELEASE loSbAuth
    RELEASE loRest
    RELEASE loSbJsonResponse
    CANCEL
ENDIF

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
loJson.EmitCompact = 0
loJson.LoadSb(loSbJsonResponse)

* (optional) Save the entire JSON response to a file to examine if desired..
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbTemp = CreateObject('Chilkat.StringBuilder')
loJson.EmitSb(loSbTemp)
loSbTemp.WriteFile("qa_output/paypal_payments.json","utf-8",0)

? "Response Status Code = " + STR(loRest.ResponseStatusCode)

* Did we get a 200 success response?
IF (loRest.ResponseStatusCode <> 200) THEN
    ? loJson.Emit()
    ? "Failed."
    RELEASE loJsonToken
    RELEASE loSbAuth
    RELEASE loRest
    RELEASE loSbJsonResponse
    RELEASE loJson
    RELEASE loSbTemp
    CANCEL
ENDIF

* We are looking for "capture" resources .
* As shown below, we are looking in the "transactions" for "related_resources"
* containing "capture" JSON objects. 

* 	{ 
* 	  "payments": [
* 	    { 
* 	      "id": "PAY-2CY489250W145633HLA3DK3Y",
* 	      "create_time": "2016-11-24T00:33:51Z",
* 	      "update_time": "2016-11-24T00:40:54Z",
* 	      "state": "approved",
* 	      "intent": "authorize",
* 	      "payer": { 
* 	        "payment_method": "credit_card",
* 	        "funding_instruments": [
* 	          { 
* 	            ...
* 	          }
* 	        ]
* 	      },
* 	      "transactions": [
* 	        { 
* 	          "amount": { 
* 	            ...
* 	          },
* 	          "description": "This is the payment transaction description.",
* 	          "related_resources": [
* 	            { 
* 	              "authorization": { 
* 	                ...
* 	              }
* 	            },
* 	            { 
* 	              "capture": { 
* 	                "id": "1LY5310469661362J",
* 	                "create_time": "2016-11-24T00:40:50Z",
* 	                "update_time": "2016-11-24T00:40:54Z",
* 	                "amount": { 
* 	                  "total": "4.54",
* 	                  "currency": "USD"
* 	                },
* 	                "state": "completed",
* 	                "parent_payment": "PAY-2CY489250W145633HLA3DK3Y",
* 	                "transaction_fee": { 
* 	                  "value": "0.43",
* 	                  "currency": "USD"
* 	                },
* 			...
* 

* Iterate over the payments and show each capture
lnNumPayments = loJson.SizeOfArray("payments")
i = 0
DO WHILE i < lnNumPayments
    loJson.I = i
    j = 0
    lnNumTransactions = loJson.SizeOfArray("payments[i].transactions")
    DO WHILE j < lnNumTransactions
        loJson.J = j
        lnNumRelatedResources = loJson.SizeOfArray("payments[i].transactions[j].related_resources")
        k = 0
        DO WHILE k < lnNumRelatedResources
            loJson.K = k
            IF (loJson.HasMember("payments[i].transactions[j].related_resources[k].capture") = 1) THEN
                loJsonCapture = loJson.ObjectOf("payments[i].transactions[j].related_resources[k].capture")
                ? "capture id: " + loJsonCapture.StringOf("id")
                ? "state: " + loJsonCapture.StringOf("state")
                ? "total: " + loJsonCapture.StringOf("amount.total")
                ? "----"
                RELEASE loJsonCapture
            ENDIF

            k = k + 1
        ENDDO
        j = j + 1
    ENDDO
    i = i + 1
ENDDO

? "success"

RELEASE loJsonToken
RELEASE loSbAuth
RELEASE loRest
RELEASE loSbJsonResponse
RELEASE loJson
RELEASE loSbTemp