QB Issue Resolution:

assuming the wallet is a liability account in your accounting

create a service type item, name it, set the rate to -0.1 (negative zero point one) and select the wallet liability account on the item screen

use that item on the sales invoice or sales receipt, in the qty block enter the **amount** to be discounted

Resolution for Issue 'How to record 10% Cash back given to the customer On purchases' available: Yes (Solved).
Source: Intuit Community forum.

How to record 10% Cash back given to the customer On purchases: 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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