当用户在我的网站上升级他们的订阅时，IPN会联系我，然后我想使用php联系PayPal取消他们可能拥有的任何现有订阅。我该怎么做？我只能使用用户必须单击的按钮找到如何做到这一点。
这是我找到的最佳解决方案：
http://thereforei.am/2012/07/03/cancelling-subscriptions-created-with-paypal-standard-via-the-express-checkout-api/
/**
* Performs an Express Checkout NVP API operation as passed in $action.
*
* Although the PayPal Standard API provides no facility for cancelling a subscription, the PayPal
* Express Checkout NVP API can be used.
*/
function change_subscription_status( $profile_id, $action ) {
$api_request = 'USER=' . urlencode( 'api_username' )
. '&PWD=' . urlencode( 'api_password' )
. '&SIGNATURE=' . urlencode( 'api_signature' )
. '&VERSION=76.0'
. '&METHOD=ManageRecurringPaymentsProfileStatus'
. '&PROFILEID=' . urlencode( $profile_id )
. '&ACTION=' . urlencode( $action )
. '&NOTE=' . urlencode( 'Profile cancelled at store' );
$ch = curl_init();
curl_setopt( $ch, CURLOPT_URL, 'https://api-3t.sandbox.paypal.com/nvp' ); // For live transactions, change to 'https://api-3t.paypal.com/nvp'
curl_setopt( $ch, CURLOPT_VERBOSE, 1 );
// Uncomment these to turn off server and peer verification
// curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, FALSE );
// curl_setopt( $ch, CURLOPT_SSL_VERIFYHOST, FALSE );
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 );
curl_setopt( $ch, CURLOPT_POST, 1 );
// Set the API parameters for this transaction
curl_setopt( $ch, CURLOPT_POSTFIELDS, $api_request );
// Request response from PayPal
$response = curl_exec( $ch );
// If no response was received from PayPal there is no point parsing the response
if( ! $response )
die( 'Calling PayPal to change_subscription_status failed: ' . curl_error( $ch ) . '(' . curl_errno( $ch ) . ')' );
curl_close( $ch );
// An associative array is more usable than a parameter string
parse_str( $response, $parsed_response );
return $parsed_response;
}
例：
change_subscription_status( 'I-NARPL1C00000', 'Cancel' );
我希望它有所帮助