It's great to have you here in the Community. Let me share information about adding a pay button to your website.
At the moment, the option to add a pay button to a website is currently unavailable. However, you can check our QuickBooks Apps Store or other third-party apps that can help you do this.
Furthermore, if you have QuickBooks Payments, you can check out this article to learn how to receive and process payments online, in-person, or over the phone: Receive and process payments in QuickBooks Online with QuickBooks Payments.
Let me know if you have further concerns about adding a pay button on your website or need assistance with QuickBooks. Keep safe.