QB Issue Resolution:

When issuing a refund, you can use the same GST code you use on your invoice. This offsets the GST amount in your GST Liabilities Payable account. Then, your BAS won’t show any taxes for this transaction, as if no sale was made. I’m adding screenshots for visuals.

Resolution for Issue 'When issuing a refund, what GST code do I put it as?' available: Yes (Solved).
Source: Intuit Community forum.

When issuing a refund, what GST code do I put it as?: 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 GST Code
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Error Recovery for GST Code [Canada]
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