Modifies the Easy Digital Downloads cancellation link to point to a custom "Confirm cancellation" page

edd-custom-cancel.php

<?php

/**
 * Modify the EDD cancel URL to point custom cancellation page.
 *
 * @param string           $url          The cancel URL.
 * @param EDD_Subscription $subscription The subscription.
 */
function wpf_edd_subscription_cancel_url( $url, $subscription ) {

	if ( is_admin() ) {
		return $url;
	}

	$args = array(
		'sub_id' => $subscription->id,
	);

	return add_query_arg( $args, get_site_url( null, '/account/cancel-subscription/' ) );

}

add_filter( 'edd_subscription_cancel_url', 'wpf_edd_subscription_cancel_url', 10, 2 );

/**
 * Cancel subscription shortcode. Put this on the custom cancellation page.
 */
function wpf_cancel_subscription_link() {

	$args = array(
		'edd_action' => 'cancel_subscription',
		'sub_id'     => absint( $_GET['sub_id'] ),
	);

	$url = wp_nonce_url( add_query_arg( $args, get_site_url( null, '/account/' ) ), 'edd-recurring-cancel' );

	return '<a href="' . esc_url_raw( $url ) . '">No thanks, cancel my subscription anyway &raquo;</a>';

}

add_shortcode( 'wpf_cancel_subscription_link', 'wpf_cancel_subscription_link' );

/**
 * Shortcode for EDD subscription cancelled confirmation.
 */
function wpf_edd_messages() {

	if ( isset( $_GET['edd-message'] ) && 'cancelled' === $_GET['edd-message'] ) {

		$content  = '<div class="elementor-element elementor-element-5d6fa8b elementor-widget elementor-widget-alert" data-id="5d6fa8b" data-element_type="widget" data-widget_type="alert.default"><div class="elementor-widget-container"><div class="elementor-alert elementor-alert-success" role="alert"> <span class="elementor-alert-title">';
		$content .= 'Your subscription was successfully cancelled.';
		$content .= '</span></div></div></div>';

	}

}

add_shortcode( 'wpf_edd_messages', 'wpf_edd_messages' );