Looks like Stripe is telling our plugin that the API key you provided in the settings is incorrect. Stripe is giving the following response to our plugin when it tries to submit the info to Stripe:
Invalid API Key provided
Double check the API key in your stripe account and make sure you have copied and pasted the correct API keys in the correct fields. Sometimes users make a copy and paste mistake. The following page has info on how to configure the API keys:
General Settings Configuration of the Accept Stripe Payments Plugin
Also, edit the individual product and check if you have entered API key info in there. If you did, double check that API key value.