Website Customizations
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Follow this documentation to learn how to connect a merchant account to your website.
First, login to your Magento admin panel.
Next, navigate to Stores > Configuration
Next, navigate to Sales > Payment Methods
Next, navigate to Authorize.net > and click General dropdown section
You will want to make sure Debug and Sandbox Mode are set to YES.
Now you will need to enter in your Login ID, Transactional Key, Client Key, & Signature. It’s best to copy and paste your information into these sections so you don’t make mistakes.
Next, scroll down to credit card section.
Turn Enabled to Yes > Payment action is Authorize and Capture > Pick your countries > and pick the credit cards you accept
Now all you need to do is click Save Config in the top right corner and make sure to clear/flush your Magento cache.