|Index||-||FAQ - Cart Help Buttons - Extra Features - Recurring Billing - Field Descriptions - Other Information|
The CustomerID is a value that the merchant can use to records a unique identifier for their customer. The shopping cart does not use this value. We simply store it and send it back to the merchant under certain circumstances.
A custom CustomerID can be sent using a CustomerID hidden tag in any cart button eg
<input type="hidden" name="CustomerID" value="your data here">
For more information please view this FAQ.
Save the CustomerID Value With Recurring Products