(Lianja) PayPal -- Get an OAuth 2.0 Access Token

Demonstrates how to send a request to get a PayPal OAuth2 access token. Sends an HTTP request equivalent to the following:

curl https://api.sandbox.paypal.com/v1/oauth2/token \
  -H "Accept: application/json" \
  -H "Accept-Language: en_US" \
  -u "Client-Id:Secret" \
  -d "grant_type=client_credentials"

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// Note: Requires Chilkat v9.5.0.64 or greater.

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

loRest = createobject("CkRest")

// 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.
llBAutoReconnect = .T.
llSuccess = loRest.Connect("api.sandbox.paypal.com",443,.T.,llBAutoReconnect)
if (llSuccess <> .T.) then
    ? loRest.LastErrorText
    release loRest
    return
endif

// Duplicate this request:

// 	curl https://api.sandbox.paypal.com/v1/oauth2/token \
// 	  -H "Accept: application/json" \
// 	  -H "Accept-Language: en_US" \
// 	  -u "Client-Id:Secret" \
// 	  -d "grant_type=client_credentials"

loRest.AddHeader("Accept","application/json")
loRest.AddHeader("Accept-Language","en_US")

// For additional help on where to find  your client ID and API secret, see PayPal Client_ID and API_Secret
loRest.SetAuthBasic("PAYPAL_REST_API_CLIENT_ID","PAYPAL_REST_API_SECRET")

loRest.AddQueryParam("grant_type","client_credentials")

lcResponseStr = loRest.FullRequestFormUrlEncoded("POST","/v1/oauth2/token")
if (loRest.LastMethodSuccess <> .T.) then
    ? loRest.LastErrorText
    release loRest
    return
endif

? loRest.LastRequestHeader

// A sample response:

// 	{
// 	  "scope": "https://api.paypal.com/v1/payments/.* https://api.paypal.com/v1/vault/credit-card https://api.paypal.com/v1/vault/credit-card/.*",
// 	  "access_token": "EEwJ6tF9x5WCIZDYzyZGaz6Khbw7raYRIBV_WxVvgmsG",
// 	  "token_type": "Bearer",
// 	  "app_id": "APP-6XR95014BA15863X",
// 	  "expires_in": 28800
// 	}

loJson = createobject("CkJsonObject")
loJson.Load(lcResponseStr)
loJson.EmitCompact = .F.

// Check the response status code.  A 200 indicates success..
if (loRest.ResponseStatusCode <> 200) then
    ? loJson.Emit()
    ? "Failed."
    release loRest
    release loJson
    return
endif

// Given that the access token expires in approx 8 hours,
// let's record the date/time this token was created.
// This will allow us to know beforehand if the token
// is expired (and we can then fetch a new token).
loDateTime = createobject("CkDateTime")
llBLocalTime = .F.
lnDtNow = loDateTime.GetAsUnixTime(llBLocalTime)
loJson.AppendInt("tokenCreateTimeUtc",lnDtNow)

// Examine the access token and save to a file.
? "Access Token: " + loJson.StringOf("access_token")
? "Full JSON Response:"
? loJson.Emit()

loSbResponse = createobject("CkStringBuilder")
loSbResponse.Append(loJson.Emit())
llBEmitBom = .F.
loSbResponse.WriteFile("qa_data/tokens/paypal.json","utf-8",llBEmitBom)


release loRest
release loJson
release loDateTime
release loSbResponse