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
  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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