QB Issue Resolution:

However, you can send a request support for your bank if it’s not yet added. On the Connect an account page, click the Request support for your bank. Provide the bank’s name and web address, then click Request.

If you’re referring to receiving online payments, it’s unavailable in your region. You can check out this article on how to record a customer payment: https://community.intuit.com/articles/1781149.

Resolution for Issue 'Could I connect my bank account to receive world-wide payment online if I reside in Cambodia?' available: Yes (Solved).
Source: Intuit Community forum.

Could I connect my bank account to receive world-wide payment online if I reside in Cambodia?: 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.

Support for Cambodia
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Error Recovery for Cambodia [Canada]
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