B4X

PayPal -- Get an OAuth 2.0 Access Token

See more PayPal Examples

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"

B4X

Dim success As Boolean = False

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

Dim rest As ChilkatRest
rest.Initialize("rest")

'  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.
Dim bAutoReconnect As Boolean = True
success = rest.Connect("api.sandbox.paypal.com", 443, True, bAutoReconnect)
If success <> True Then
    Log(rest.LastErrorText)
    Return
End If


'  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"

rest.AddHeader("Accept", "application/json")
rest.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
rest.SetAuthBasic("PAYPAL_REST_API_CLIENT_ID", "PAYPAL_REST_API_SECRET")

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

Dim responseStr As String = rest.FullRequestFormUrlEncoded("POST", "/v1/oauth2/token")
If rest.LastMethodSuccess <> True Then
    Log(rest.LastErrorText)
    Return
End If


Log(rest.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
'  	}

Dim json As ChilkatJsonObject
json.Initialize
json.Load(responseStr)
json.EmitCompact = False

'  Check the response status code.  A 200 indicates success..
If rest.ResponseStatusCode <> 200 Then
    Log(json.Emit)
    Log("Failed.")
    Return
End If


'  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).
Dim dateTime As ChilkatDateTime
dateTime.Initialize
Dim bLocalTime As Boolean = False
Dim dtNow As Int = dateTime.GetAsUnixTime(bLocalTime)
json.AppendInt("tokenCreateTimeUtc", dtNow)

'  Examine the access token and save to a file.
Log("Access Token: " & json.StringOf("access_token"))
Log("Full JSON Response:")
Log(json.Emit)

Dim sbResponse As ChilkatStringBuilder
sbResponse.Initialize
sbResponse.Append(json.Emit)
Dim bEmitBom As Boolean = False
sbResponse.WriteFile("qa_data/tokens/paypal.json", "utf-8", bEmitBom)