QB Issue Resolution:

If you have an existing merchant account through Intuit, you can add mobile processing through GoPayment! Here’s how:

Go to the Merchant Service Center at http://merchantcenter.intuit.com.
Sign in using a QuickBooks Online administrator user ID and password.
If you have more than one QuickBooks Online company under this user ID with a merchant account, you’ll need to check the green Account pulldown box and make sure you’re using the company you want to change; if not, change it here.
Choose Account > GoPayment.
In the Processing Information table find the row labeled Process with GoPayment and click to select On.
Click Submit Changes.

You should now be able to download the GoPayment app to your phone and start accepting payments. See KB 4737 for those steps.

To get your free card reader use this link http://payments.intuit.com/reader-fulfillment/redemption_form.jsp

Details
Answer ID 4738
Products QuickBooks Online Basic
QuickBooks Online Edition
QuickBooks Online Simple Start
QuickBooks Online Essentials
QuickBooks Online Plus
QuickBooks Online Simple Start (H)
QuickBooks Online Essentials (H)
QuickBooks Online Plus (H)
Categories Merchant Account Service
Date Created 09/08/2011 08:11 PM
Date Updated 04/21/2015 02:12 PM
Allow Crawling? Yes

Resolution for Issue 'Adding GoPayment to an existing QuickBooks Payments account.' available: Yes (Solved).
Source: Intuit Community forum.

Adding GoPayment to an existing QuickBooks Payments account.: 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 gopayment
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