I've read through the documentation several times, code examples, etc. I thought I read somewhere that a Custom Tender can't modify an order but I can't find a reference to that info again.
I specifically have tried to add a Customer to the Order in a custom tender (to pre-populate an email address) and it didn't update the Order. I used the exact same code in a MODIFY_ORDER intent and that did update the Order with the Customer.
Can someone confirm if a custom tender can update an Order? Also, if there are specific restrictions on what can/can't be updated in the custom tender that would be helpful as well.
Thanks.