Fellowship One REST API Auth Core v1.0
Abstract This Authentication protocol is an extension of the OAuth 1.0 protocol which enables websites or applications (Consumers) to access Protected Resources from a web service (Service Provider) via an API, without requiring Users to disclose their Service Provider credentials to the Consumers. More generally, OAuth creates a freely-implementable and generic methodology for API authentication.
https://demo.fellowshiponeapi.com/v1/Content/F1OAuthExtensionv1.html
Abstract This Authentication protocol is an extension of the OAuth 1.0 protocol which enables websites or applications (Consumers) to access Protected Resources from a web service (Service Provider) via an API, without requiring Users to disclose their Service Provider credentials to the Consumers. More generally, OAuth creates a freely-implementable and generic methodology for API authentication.
https://demo.fellowshiponeapi.com/v1/Content/F1OAuthExtensionv1.html