PayPal Standard Filters
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gform_paypal_action_fields
This hook is used add individual options to the PayPal feed.
gform_paypal_add_option_group
This hook is used to add groups of options to the PayPal feed.
gform_paypal_business_email
Allows changes to be made to the PayPal business email while validating the IPN from PayPal.
gform_paypal_config_validation
Used to validate custom settings/meta specified using the gform_paypal_action_fields or gform_paypal_add_option_group action hooks.
gform_paypal_feed_settings_fields
This filter allows adding custom settings fields to PayPal Standard.
gform_paypal_field_value
This filter can be used to modify a value before it is sent to PayPal using the PayPal Standard Add-On.
gform_paypal_fulfillment
This hook runs when a transaction is completed successfully for the PayPal Standard Add-on and can be used to fire actions dependent on a successful PayPal transaction.
gform_paypal_get_payment_feed
This filter allows the filtering of return configuration feeds.
gform_paypal_hash_matches
This filter allows additional validation of the hash to be performed.
gform_paypal_invoice
This filter allows the invoice number, sent to PayPal for the PayPal Standard Add-on, to be changed.