@mparker11, Yes API calls can be made from your local machine on localhost. Can you provide a little more information on the
Invalid client configuration error you’re receiving? What endpoint are you calling? What does your request body look like (if applicable)?
It sounds like you’re attempting to make a request to the Dwolla API from the front-end of your application which is not recommended. Instead, all API calls should be made by your backend server(s), which should securely store your API credentials and manage other business logic surrounding payments.