- Sign in to your Authorize.net account.
- Click the Account tab at the top of the screen.
- The API Login ID and Transaction Key in this screen, need to precisely match the API Login ID and Transaction Key in Core > Settings > Payment Settings > Select Payment Processing.
- Edit the Authorize.net account.
- Enter the API Login ID (case-sensitive) in the Account Login field.
- Enter the Transaction Key (case-sensitive) in the Password field.
- Click Save.
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