login url

In the past our Phone App would access our WordPress site login URL to register and verify user permissions for Phone App features.
Does Wix have something similar? Can I Post a login form to our Wix site member login area? There is no login URL to post to.

You can very easily access it through code just use the wix users api or wix users backend api and look at the login section of each here:
https://www.wix.com/code/reference/wix-users.html
https://www.wix.com/code/reference/wix-users-backend.html

Take code snippets from here:
Velo Tutorial: Building Your Own Members Area | Help Center | Wix.com -

Or simple code like this:

import wixUsers from 'wix-users';
import wixLocation from 'wix-location';

$w.onReady(function () {
$w('#register').onClick(function () {
let email = $w('#email').value;
let password = $w('#password').value;
wixUsers.register(email, password)
.then(() => {
wixLocation.to('/mywebpage');
})
})
})

Or this for custom login lightbox:

import wixUsers from 'wix-users';
import wixLocation from 'wix-location';
import wixWindow from 'wix-window';

$w.onReady(function () {
 $w("#forgotPassword").onClick( (event) => {
    //wixWindow.lightbox.close()
   wixUsers.promptForgotPassword()
   .then( ( ) => {
   //
   } )
    .catch( (err) => {
    let errorMsg = err;  //"The user closed the forgot password dialog"
    });
 });
});

export function loginButton_onclick(event) {

 let email = $w("#email").value;
 let password = $w("#password").value;

 wixUsers.login(email, password)
   .then( () => {
     console.log("User is logged in");
     wixWindow.lightbox.close();
     wixLocation.to(wixLocation.url);
   } )
    .catch( (err) => {
     console.log(err);
     $w("#errorMessage").expand();
   } ); 
}

I think i need something that supports a URL so that my http client in my iOS or Android App (actually Xamarin) issues a http POST to the login URL of my site.