Only thing I could find wis this post from 2021: https://community.clover.com/questions/34703/tips-adjustment-for-online-orders-using-ecom-api.html . Has anything changed since then?
This is an integral part of our restaurant-inudstry ordering site (using tip line on printed receipt), and all other e-commerce gateways we've integrated with have supported tip adjustments at capture. This is just an accepted part of the restaurant online ordering model. Do you still not support it?