The API Login ID and Transaction Key are unique to your Authorize.net account. They are used to connect your website, shopping cart, or other integrated business applications to the Authorize.net Payment Gateway for transaction processing. You can click the link below to learn how to obtain and use them with your Authorize.net account.
https://support.authorize.net/knowledgebase/Knowledgearticle/?code=000001271
Authorize.net has several great resources for its merchants:
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