Initiating Oauth process in BigCommerce - oauth

I had been authorizing bigcommerce user via legacy API method.
Now we are planing to start authorization using Oauth process.
Till now i have created an app in Developer portal- got client id and secret. Added callback url
My question is How can i initiate Oauth process for bigcommerce users from my web app?
I am unable to find this in Docs.
Like for other gateways like Shopify, we need to hit an url with client ID, then it used to redirect to login url.

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Azure Api management with Oauth - Without a client app registration

I currently have an API that I am opening up to our business partners to call, and I want it secured with OAuth.
I've set up an Azure API management (consumption plan right now) that points to our API in azure.
I can call it and get valid results in the test console.
So I was following the Microsoft documentation for this, and it had me :
Register my backend API in app registrations;
Register a client app in app registrations;
In azure AD grand the permissions for this client app;
Configure the APIM with a validate-jwt policy.
So now my APIM is returning a 403 as expected.
My question is this. I do not know the clients that will be using this API. Or rather, do I HAVE to register a client app registration? Or can I leave that part out, and just provide the URLS that I have for the OAUTH side, which are like :
https://login.microsoftonline.com/GUID/oauth2/v2.0/authorize
https://login.microsoftonline.com/GUID/oauth2/v2.0/token
I am very new to Oauth and APIM, so I am not even sure how all this works.
But it seems odd that I am registering an app for a client, when I have no information on them or how they are calling my API.
I kinda get that I need to know who is requesting the token and authorizing. But the clients will be using a javascript snippet that we give them to embed on their site, so I dont really know what their site is like, what their URL is or anything.
Hope that makes sense.
The client registration is what represents the entity (web app, mobile app, etc.) that requests for tokens from Azure AD for your API.
The docs walk you through a process where the developer portal is registered as the client.
The snippet in your case would also require a Client ID (of an app) to fetch the token with. For this, you would have to register a new app registration and share the Client ID as part of the snippet.

FeathersJS: REST authentication of an OAuth user

I've created a FeathersJS backend app and a React frontend app. I'm using OAuth2 strategy to authenticate users to my own WordPress site. Everything is working fine. But now I'd like the users to be able to access my FeathersJS backend REST API, but as they authenticate through the WordPress OAuth2 server, thus following all the OAuth2 authentication process through my React frontend app, which would be the correct FeathersJS way to allow the users authenticate to my backend so that they can do REST API calls?
But now I'd like the users to be able to access my FeathersJS backend REST API
To let people access your backend REST API (which I assume is only possible after they authenticate), you need to check whether the access token they have is, in fact, valid with the third party auth provider.
You can directly let them use the back end API. In case the API doesn't find a valid access token with the incoming request, it will redirect it to the login page. After which, now the backend can validate itself with third-party OAuth provider and return the result.
following all the OAuth2 authentication process through my React frontend app
It is recommended to not do all the OAuth check from front-end since this exposes the access-token on the user agent, which might be a serious issue. See this:
https://www.digitalocean.com/community/tutorials/an-introduction-to-oauth-2#grant-type-implicit

Oauth authentication with laravel passport for mobile app

I am using laravel passport for authorization from mobile app.
But I'm not sure where to place the client credentials i.e client_id/client_secret and redirect_uri.
Will it be placed at mobile app end and they will pass these to an API while authenticating to get tokens or these details be kept at server side in some env variables for security purpose?
And will the every user be having different client_id and secret or it will be same for all users throughout the application.
The client credentials grant type is for when you want your application to contact the server with out a user. For example a weather app will contact the server to get the latest weather data. It does not need to user to login to do this. You want to client credentials because you do not want everyone using your api. It is a way to protect your api and only allow your approved apps to access the api information.
Yes you will pass the client_id/client_secret from your mobile/desktop application to the /oauth/token url on your server so it will return an access token for you to use when getting all the information through the api.
The client_id and client secret do not need a user. It is for the client (Mobile/Desktop application). But it will be the same for every user since they all will be using the same mobile/Desktop application.

Authorize existing app to different account without authorize page

I created an app on one twitter account. I would like to authorise that same app on a different account.
FAQ on how to authorise apps says On the website of the application you want to connect, find the button/link asking you to connect your Twitter account. But I haven't built said site/page.
How can I auth this app on the second account?
You have to use the OAuth Authentication Flow process.
To do so, you first need to request an authentication link from your Consumer Key and Consumer Secret using https://api.twitter.com/oauth/request_token (doc : https://dev.twitter.com/oauth/reference/post/oauth/request_token).
When you receive a callback or a code, you can use them to execute a second query that is https://api.twitter.com/oauth/access_token as described at https://dev.twitter.com/oauth/reference/post/oauth/access_token. You will want to use the oauth_verifier parameter.
Remember that authentication in Twitter is not an easy process and you should read more about it on Twitter (https://dev.twitter.com/oauth/3-legged) or use a library that will do that for you.

Using REST api and oAuth2 with iOS app

I'm a complete beginner in RESTful services in general. I am required to make an app that would require a user to log in with his credentials and then use the oAuth token to access the provided api.
I registered the app that I made and I have the Client ID and Client secret.
Now I have two questions:
How should the URI look like when I try to get the oAuth token?
What is the redirect uri used for?

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