QB Issue Resolution:

Hi Chad,

Short answer is, you don’t.

Payroll, and its functionality, are included on QuickBooks Online. Once you use the feature (under Employees>Run Payroll) you’ll be billed for it, thus negating the need for service/license keys.

Let me know if you need more help with this. Have a great day!

Resolution for Issue 'payroll service key' available: Yes (Solved).
Source: Intuit Community forum.

payroll service key: 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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