In Authorize.net:

  1. Log in to your account
  2. Click on Account, and then Settings
  3. Under 'Security Settings' click API Login ID and Transaction Key
  4. Generate and make note of your API Login ID and Transaction Key

In Optix:

  1. Select Integrations from the left-hand menu
  2. Scroll down until you find 'Authorize.net', and click Connect
  3. Input your Authorize.net API login ID in the 'login' field
  4. Input your Authorize.net Transaction Key in the 'password' field
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