Phonegap:- Snapchat Authentication Implementation - phonegap-plugins

I'm working on a project which will use SnapChat authentication in my PhoneGap app. I looked around in the SnapChat API documentation, but i couldn’t find anything about this subject.
So my question is, is there any plugin or API available to authenticate through SnapChat in a PhoneGap application? Please help me.

I believe there’s no legal way to authenticate through SnapChat at the moment. They neither expose APIs nor some authentication flow.

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Private API for React (MERN)

I've been working on using the MERN Stack to build my web apps, and the only way that I have found to connect to Mongo is using an API. I want to make sure my users' information stays private. So how would I go about doing that? Is it possible? If not, how should I connect React to my database?
Thanks for reading, and I'm sorry for any unclear information. I'm new to this and don't know how to convey my problem.
It doesn't matter if you are using the MEAN or the MERN stack. Authenticating APIs is pretty standard and for the most part, has been answered here on stackoverflow:
Please go to this link:
REST API Authentication.
What you are looking to do is using the OAuth authentication standard. There are organizations that provide these services. Auth0 and okta are examples.

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I'm trying to create a login system with Node as the backend/web service for the app, also with an iOS app. I'm trying to use Amazon Cognito to do this, but I can't figure out how to register/authenticate users from either end. The only tutorials I've been able to find use Facebook login, which don't help me.
Edit: I have unauthenticated identities working somewhat, but I'm still clueless as to the authenticated developer identities.
While I understand you are looking specifically for a Node sample, we do have a full end-to-end sample with a Java backend and iOS and Android clients.
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Searching online for oauth yields various platforms and how to sign in, etc but has no resources on how to provide oauth access myself.
How would I go about building a platform allowing 3rd party access? Are there any tutorials?
Eventually I want to make a passport plugin if that helps in suggestions.
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Is it possible to login someone with their facebook account through a restful service?

I ran across this Node.js example, which makes me think that it is possible, but when I tried to setup the example locally, it doesn't seem to do anything. It would seem to me that it would not be possible, as the login for most of these services, like Facebook Connect and OpenID, require a redirect to the provider's site, then a redirect back to your site.
What I am trying to accomplish in the long-run is to develop an application using a combination of PhoneGap with a Node.js restful backend. I am not integrating with Facebook, other than to use the login credentials. I have to admit that my understanding of OAUTH, OpenID, and Facebook Connect is rather novice. I would like to have my PhoneGap application simply send over the credentials and have my Node.js authenticate them.
Yes this can be done. I believe the server-side code handles the redirect. Here is a good explanation of the solution.

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