QB Issue Resolution:

What state do you live in?  Some do not allow for that legally: https://www.cardfellow.com/checkout-fees-charging-credit-card-fees-to-customers/#StatesSurchargingBanned

If your state does, you can create an item that points to credit card fees and charge it to customers.

Resolution for Issue 'How do I charge customer for credit card fee?' available: Yes (Solved).
Source: Intuit Community forum.

How do I charge customer for credit card fee?: 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 credit card fee
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Error Recovery for credit card fee [Canada]
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