QB Issue Resolution:

Click in File-Setup Interview-Payments- the radio button that says do you accept credit cards, check NO, and then done.

Resolution for Issue 'how do i get rid of “Point of Sale Merchant Service Message?”' available: Yes (Solved).
Source: Intuit Community forum.

how do i get rid of “Point of Sale Merchant Service Message?”: 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
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Error Recovery for Credit Card [Canada]
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Additional Support Options: