An overview of how to use Gravity Forms to cancel a WooCommerce Subscription programically

wcs-functions.php

/* This code is NOT safe for production usage. Do not use in live systems */

/* Add to functions.php */

add_action( 'gform_after_submission', 'wc_demo_cancel_sub', 10, 2 );

function wc_demo_cancel_sub( $entry, $form ) {
 
    //Get the subscription id from the form
    //We assume the field wc_sub_id contains the subscription ID
    $subscription_id = $entry['wc_sub_id'];
    
    //Do some error handling i.e. Ensure it exists, is an int etc
    
    //Fetch the Subscription
    $subscription = wcs_get_subscription( $subscription_id );
    
    //Cancel the subscription (Again, should be more error handling here)
    $subscription->update_status('cancelled');
    
    return;
  
}