In Heartland:

  1. Log in and navigate to your 'Account Settings' screen
  2. Locate and make note of your 'Secret API Key'

In Optix:

  1. Select Apps from the left-hand menu then click Find new appsĀ 
  2. Scroll down and click Heartland Payment Systems
  3. Click Install
  4. Input the 'Secret API Key' you retrieved from Heartland
  5. Click SaveĀ 
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