(PHP Extension) 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"

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

// 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.

$rest = new 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.
$bAutoReconnect = true;
$success = $rest->Connect('api.sandbox.paypal.com',443,true,$bAutoReconnect);
if ($success != true) {
    print $rest->lastErrorText() . "\n";
    exit;
}

// 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');

$responseStr = $rest->fullRequestFormUrlEncoded('POST','/v1/oauth2/token');
if ($rest->get_LastMethodSuccess() != true) {
    print $rest->lastErrorText() . "\n";
    exit;
}

print $rest->lastRequestHeader() . "\n";

// 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
// 	}

$json = new CkJsonObject();
$json->Load($responseStr);
$json->put_EmitCompact(false);

// Check the response status code.  A 200 indicates success..
if ($rest->get_ResponseStatusCode() != 200) {
    print $json->emit() . "\n";
    print 'Failed.' . "\n";
    exit;
}

// 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).
$dateTime = new CkDateTime();
$bLocalTime = false;
$dtNow = $dateTime->GetAsUnixTime($bLocalTime);
$json->AppendInt('tokenCreateTimeUtc',$dtNow);

// Examine the access token and save to a file.
print 'Access Token: ' . $json->stringOf('access_token') . "\n";
print 'Full JSON Response:' . "\n";
print $json->emit() . "\n";

$sbResponse = new CkStringBuilder();
$sbResponse->Append($json->emit());
$bEmitBom = false;
$sbResponse->WriteFile('qa_data/tokens/paypal.json','utf-8',$bEmitBom);

?>