This filter allows custom logic to be used to determine if a payment add-on which extends GFPaymentAddOn should process the submission for the given amount.

Short Slug Values

The Gravity Forms Add-On Slugs article lists the available short slugs to use with this hook.


The base filter which would run for all forms and all fields would be used like so:

add_filter( 'gform_stripe_is_valid_payment_amount', 'your_function_name', 10, 5 );

To target a specific form append the form id to the hook name. (format: gform_{$SHORT_SLUG}_field_value_FORMID)

add_filter( 'gform_stripe_is_valid_payment_amount_10', 'your_function_name', 10, 5 );


  • $is_valid bool

    Indicates if the amount is valid for processing. Default is true when the amount is greater than zero.

  • $submission_data Submission Data Object

    Contains the form title, payment amount, setup fee amount, trial amount, line items created using the submitted pricing field values, and any discounts from coupons.

  • $feed Feed Object

    The feed to be processed.

  • $form Form Object

    The form currently being processed.

  • $entry Entry Object

    The temporary entry containing the submitted values.


1. PayPal custom minimum amount

This example shows how you can prevent the add-on proccessing submissions where the amount is less than $1.

add_filter( 'gform_stripe_is_valid_payment_amount', function( $is_valid, $submission_data ) {

return floatval( $submission_data['payment_amount'] ) > 1;
}, 10, 2 );


This code should be placed in the functions.php file of your active theme.


This filter was added in Gravity Forms 2.4.18.

Source Code

$tag_args = array( sprintf( 'gform_%s_is_valid_payment_amount', $this->get_short_slug() ), $form_id );
$is_valid = (bool) gf_apply_filters( $tag_args, $is_valid, $submission_data, $feed, $form, $entry );

This filter is located in GFPaymentAddOn::is_valid_payment_amount() in includes/addon/class-gf-payment-addon.php.