QB Issue Resolution:

The option will need to be turned on in the invoice in order for the customer to pay online. At the very top of the invoice when it’s being created we’ll see a little toggle that says online payment. We’ll make sure that it’s switched to ON.

To log into your QuickBooks Payments account, you will go here!

Let me know if that works! I want to make sure we get this going for you!

Resolution for Issue 'I cannot find or log into my pay online account with Intuit. I have had clients pay our invoices on line before. Where is it now? Why can’t client’s pay on line?' available: Yes (Solved).
Source: Intuit Community forum.

I cannot find or log into my pay online account with Intuit. I have had clients pay our invoices on line before. Where is it now? Why can’t client’s pay on line?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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