QB Issue Resolution:

While you did sign up through the app, we can still help you. All you have to do is Contact Us, and we can get you switched from Apple billing to QuickBooks billing, before your trial ends.

Please note, while your trial is ending soon, you will NOT lose data. You maintain read only access, and can update your billing info at any time. (Though if you want to continue using QuickBooks Online, I would recommend sooner ranter than later. 🙂 )

Resolution for Issue 'Trying to pay for QB as my trial is about to expire, but can’t using iOS.' available: Yes (Solved).
Source: Intuit Community forum.

Trying to pay for QB as my trial is about to expire, but can’t using iOS.: 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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