By visiting: https://shapeshift.io/legacy/affiliate.html you can sign up for an Affiliate API key to help you track your affiliate and user performance. Be sure to keep the Private Key safe!
If you have tried to sign-up for an API key and are not being given the keys after you "click here" you may need to scroll down the page to retrieve the keys. The screen does not automatically scroll down to show you the keys after you prompt the system to create them. Also, be sure to give the creation process a few minutes. If you continue to have issues, please submit a Support Request with our helpful team.