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add_filter( 'gform_field_validation_101_22', 'donate_minimum_validation', 10, 4 ); function donate_minimum_validation( $result, $value, $form, $field ) { $min_amount = 25.00; $donated = str_replace('$', '', $value); if ( $donated < $min_amount ) { $result['is_valid'] = false; $result['message'] = 'A minimum amount of $'.$min_amount.'.00 is required to reserve your spot.'; } return $result; }