Customer IDs on orders

When a signed-in customer places an order, or an administrator creates an order for a customer account, the extension copies the account's Customer ID into the order field customerid.

This preserves the business number used at order creation. Changing the customer account later does not rewrite historical orders.

Magento Admin

The sales order grid includes a CustomerID column. Use it to match Magento orders with ERP, service-desk or telephone enquiries without confusing the business number with Magento's internal customer ID.

Guest orders normally leave the field empty because no customer account supplies a Customer ID.

APIs

Loaded orders expose the value through the OrderInterface extension attribute customerid. See API integration for the field-name distinction.

Order emails

The extension adds the copied value to the order object as mageb2b_customer_id before Magento renders an order email. It does not automatically change every email template. See the field names reference before mapping customer and order data in an integration.

If your customized order template needs the value, add and test the variable in staging. Keep the template change in your theme or email customization rather than editing vendor files.

What is not changed

Customer ID does not alter order numbering, invoice numbering or credit memo numbering. It also does not place the value into invoice PDFs by itself.