Hello @cherrus thanks for your post, and WELCOME to the Square Seller Community! We're so glad you joined us. We hope you'll find some valuable information here, and maybe share your own tips and experiences with the rest of the Community.
As far as Invoices, you should be able to start creating an invoice, add your amount, and request payment without having to first request a deposit. Are you creating an invoice from your Dashboard > Payments > Invoices? There is some more info here:
https://squareup.com/help/us/en/article/5137-send-square-invoices-online
I hope this helps answer your question.
