Because you maintain a WooCommerce payment gateway plugin, a user contacts you to ask if it can do something that seriously extends the basic checkout functionality.

An e-mail conversation ensues to clarify the nature of the request and see if it is even remotely in scope for the plugin (it isn't).

Final e-mail from the user ends with, "It really isn't all that hard. I think you can probably knock it out in a day or two. ;)"