Integrating SugarCRM with website. Question about urls

To use the SugarCRM installation of a customer in any website you surely need the URL of this installation.

All the API calls must be made to this endpoint which start with the URL followed by the /rest/v10 path and the API function path like /Accounts.

It is not a kind of WDSL path for interface typing ans mapping, but a real entry point you call to get the data.

The first call must be the /rest/v10/oauth2/token with the credentials the customer handed over to you.

You can test that with any other installation like your own demo, but in the end you need the real credentials.

So I don't need an account of my own. I need to get the site url of the user.

But the problem is that the very first endpoint I need to authorize a user starts like this:

https://pijszc5463.trial.sugarcrm.eu/rest/v11_4/oauth2/token

It needs the site url. How am I supposed to authorize a user with his credentials if I don't have any site url?

For example, Salesforce has a common endpoint to authorize the user.

https://login.salesforce.com/services/oauth2/authorize 

And when the user gets authorized, we get the instance url in the response, which I use for other endpoints.

Yes, that's the difference to SF. Sugar has one site URL per customer.

So you need the site URL, a user and a password to use the API.

Thanks! I will get the url from the user.