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. Click Integrations from the left-hand menu
  2. Scroll down until you find 'Heartland', and click Connect
  3. Input the 'Secret API Key' you retrieved from Heartland
  4. Click SaveĀ 
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