PayPal Standard Filters
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gform_paypal_ipn_{transaction_type}
This filter allows actions to be performed for a specific IPN transaction type.
gform_paypal_ipn_url
This filter allows the PayPal IPN URL to which data is being posted to be modified.
gform_paypal_post_ipn
This hook is fired after a PayPal IPN response has been processed.
gform_paypal_pre_ipn
This filter is used to cancel to IPN processing.
gform_paypal_query
Use this filter to modify the query string that will be sent to PayPal.
gform_paypal_request
Use this filter to modify the URL string that will be sent to PayPal.
gform_paypal_return_url
Use this filter to modify the return URL, which is the URL that users will be sent to after completing the payment on PayPal’s site.
gform_paypal_return_url_port
This filter allow the port to be changed for the return_url that is sent to PayPal.
gform_paypal_sslverify
This filter allows the sslverify setting to be modified before sending requests to PayPal.
gform_post_payment_status
This hook is fired after an entry’s payment status has been updated and the payment was for the PayPal Standard Add-on.