Remove Gateway Choice On A Campaign/Donation Page

// add this snippet to functions.php in your theme

add_filter( 'charitable_active_gateways', 'charitable_change_gateways_per_campaign', 10, 1 );

function charitable_change_gateways_per_campaign( $gateways ) {

	global $post;

	// $gateways will be an array similar to this:

	// [offline] => Charitable_Gateway_Offline

	// [stripe] => Charitable_Gateway_Stripe_AM

	if ( ! empty( $post ) && 'campaign' == $post->post_type && '126' == $post->ID ) {

		// Do not offer stripe as a gateway for campaign with the ID of 126.

		unset( $gateways['stripe'] ); // This removes the stripe gateway from the active gateway array.

	}

	// Note: if you remove a gateway and one remains, remember you won't be shown a choice on the donation form.

	return $gateways;

}