Action: wu_transition_membership_initial_amount

Fires when the initial amount of a membership transitions from one value to another.

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

Parameters

Name	Type	Description
$old_value	`string`	The previous initial amount value.
$new_value	`string`	The new initial amount value.
$item_id	`int`	The membership ID.