I have been unable to authenticate and test my apps. I continue to receive errors such as "Oauth error invalid_request: Could not find Shopify API application with api_key:"******"". I have done the tutorials provided by Shopify for React/Node and Express/Node. Neither of them are working for me. I'm very new to Shopify and would love some further direction.
Is this for a private or public app? The API key you're seeing in the log, does it match your actual API key exactly?