QB Issue Resolution:

Adding the customer’s payment method on the invoice is unavailable. As a workaround you can enter this information on the custom field. Here’s how:

  1. Create an invoice and click Customise at the bottom.
  2. Select Edit current. 
  3. Go to Content and click the top part of the invoice.
  4. Click +Custom field from the left side.
  5. Put a check mark on one of the field.
  6. Enter the name and click Done. 

Also, I’ll take note and pass this preference over to our developers for future updates.

Resolution for Issue 'Is it possible to have the payment method displayed in the Invoice?' available: Yes (Solved).
Source: Intuit Community forum.

Is it possible to have the payment method displayed in the Invoice?: 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 customise
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Error Recovery for customise [Canada]
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