Does the Billing Manager module order history integrate with the cart module?

Yes, if you use the Billing Manager module the order history integrates with both the SmithCart and Smith Registration modules.

To enable the integration in the cart you would go to the cart payment setup screen and check the following checkbox:

Show Invoice # - When checked displays Invoice No textbox on the Step 2 checkout page where user can enter the invoice number they are paying. Can be used with cart standalone or integrated with Smith Billing Manager generated invoice numbers.

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At your service,
Dave Smith