Set up payment buttons for website

Add payment buttons to my portfolio site so clients can pay invoices directly. Create a buy-now button for the fixed-price service '30-minute consulting' at $150, and a donate-style button for variable payments. Provide the HTML snippets to drop into the contact page and confirm the buttons process payments into my business account ending 3247.

Before I add payment buttons, make the approval copy easy: surface the service name and price at the top, show the button code size and where it must be pasted on the contact page, flag what would make a reviewer hesitate—like missing callbacks, wrong account destination, or lack of mobile responsiveness—and show a screenshot of the rendered button on desktop and mobile.

I pasted the HTML button for the 30-minute consulting at $150 into my contact page and the button displays but clicking it does nothing. I’m worried the callback URL or client-side script is missing and I can’t tell if the problem is my site’s CSP, a mismatch in account credentials, or a missing JavaScript include. What is the most likely cause and the fastest fix so clients can pay today?

Over the past six months I keep redoing payment buttons: sometimes they show, sometimes they fail on mobile, and I lose sales. Where am I consistently failing—copying hosted snippets into templates, missing JS includes, or not testing on mobile—and what one habit will stop these regressions so buttons reliably accept payments across my site?