Once you have created your account, log into your store control panel, choose Edit Payment Providers and click modify for Braintree. Make sure the Enabled box is checked, and enter your Merchant ID, Public Key and Private Key..
In the "Show As" field you can enter the text of your choice as this will be shown on checkout. Typically you would enter the payment provider name or simply "Credit Card"
To locate your Merchant ID, Public Key and Private Key, log in to your Braintree account.
Go to Your Username > My User
Click on API Keys
If no API keys are showing, click "Generate New"
Click "View"?under the Private Key column
Click Copy to copy the?API configuration code.
Paste the details into the fields as above.
Under Transaction Type, choose "Authorize Capture" to capture the funds at the time of purchase. Choose "Authorize Only" if you plan on capturing the funds at a later date.
Braintree is only available for PHP users - Braintree haven't developed an API for ASP.