QB Issue Resolution:
I can see how that feature would be very useful! Right now there is not a feature in QuickBooks Online that you can turn on to have a signature line on sales receipts. You can create one as a footer in your sales forms customizations. That signature line will show up on sales receipts, invoices, and estimates though.
Resolution for Issue 'How to print a customer signature line for credit card processing in QBO like in the desktop version of QB?' available: Yes (Solved).
Source: Intuit Community forum.
How to print a customer signature line for credit card processing in QBO like in the desktop version of QB?: 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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