If you are looking to utilize the Smile API you will require both public and private API keys. Merchants can find their secret keys in the Smile Admin.
✅ API access is only available for merchants on the Smile Plus plan (Shopify & BigCommerce)
How to find your API keys
To find your API keys, navigate to Settings > Platforms.
At the top, select Show more which will reveal your public and private keys.
Smile API overview