Add metadata to a Stripe Subscription

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I have a form that creates a subscription on Stripe. It is putting all the metadata from the form feed on the customer object at Stripe. I want to add those fields to the Subscription object.

I have added the below to our custom themes functions.php file:

add_filter( 'gform_stripe_subscription_params_pre_update_customer', 'add_sub_metadata', 10, 7 );
function add_sub_metadata( $subscription_params, $customer, $plan, $feed, $entry, $form, $trial_period_days ) {
    GFCommon::log_debug( __METHOD__ . '(): running.' );
    $metadata = gf_stripe()->get_stripe_meta_data( $feed, $entry, $form, array() ); // Pass an empty array for $entry_meta
    $subscription_params['metadata'] = $metadata;
    GFCommon::log_debug( __METHOD__ . '(): The Entry => ' . print_r( $subscription_params, true ) );
    return $subscription_params;
}

I don’t see any indication that the function is running. Not that I am 100% sure where to look other than in Stripe.

Is the code correct? Better way to solve the problem?

Thanks!