I have a client who has asked me to check to have a payment page online to process invoice payments securely using Square ([login to view URL]) and how much it would cost.
I have outlined the project in this Google Doc with a sample design for the form: [login to view URL]
Open to suggestions of course regarding the design but we would like a clean and basic design as the form will be on a separate single page and not embedded on the website.
Responsive design to allow processing from mobile devices is preferable.
I hope the brief gives a good picture of the scope.