QB Issue Resolution:

“now they credit our credit card for amount of those 3 credits.”

Which means you Got The Refund.

Make a Credit Card Credit entry (like a Return) and list Accounts Payable as the Reason, instead of Office Supply expense, for instance. Use that Vendor Name.

When you make the refund as AP for the Vendor Name, you can use Pay Bills to link those open credits to the refund, because the AP refund entry shows as if it is a Bill to be paid. Paid By Applying Credits.

Resolution for Issue 'transfer existing credit in QB to credit card' available: Yes (Solved).
Source: Intuit Community forum.

transfer existing credit in QB to credit card: 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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