In the shopping cart, there are instructions for entering address, PIN, and email or key, with a single text area for input. This might be okay for crypto veterans, but not others.

Separate fields for each piece of data needed would help the user understand what the next step is.

Something like this, but with better spacing/formatting ...

Email Address, or Public Key: _____________

Lightning Address: ______________

PIN Code: ________

Comment: __________