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API uses HTTP Basic Authentication with your client ID as the username and your client secret as the password.
Your API tokens are scoped to either your production or sandbox environment.
 
curl -u "{client_id}:{client_secret}" https://api.lightspark.com/grid/2025-10-13...
If integrating with one of our SDKs, the SDK reads environment variables and will populate the credentials for you.