Once you create an account and verify your email, you will be guided through a 2 minute onboarding experience. Complete the onboarding in order to unlock access to your EyeLevel API key.
Once you have completed onboarding, request partner API access here. You will receive an e-mail once your EyeLevel API key has been upgraded for partner API access.
Your Partner API Key
Your EyeLevel API key can be found on your account page here. Look for the section titled EyeLevel API Key. This is your partner API key and will be used for authenticating partner API requests as described here.