Action: wu_transition_membership_gateway_customer_id

Fires when the gateway customer id of a membership transitions from one value to another.

This hook is fired by BerlinDB when a database UPDATE changes the gateway_customer_id column for a membership row.

Parameters

Name	Type	Description
$old_value	`string`	The previous gateway customer id value.
$new_value	`string`	The new gateway customer id value.
$item_id	`int`	The membership ID.