PHP Laravel Callback upon API authentication - php

Question

I am trying to implement a call back method in PHP. I am successfully calling an instagram API to authorise the user but I do not know how to capture the token after the user authorises.
Below is my code:
public function oAuthBasic()
{
$instagramBasic = new InstagramBasicDisplay([
'appId' => 'xxx',
'appSecret' => 'xxx',
'redirectUri' => 'xxx'
]);
session()->forget('instagramErrorMessage');
$faceBookLoginUrl = $instagramBasic->getLoginUrl();
return response()->json(['redirectUrl' => $faceBookLoginUrl]);
}
This successfully brings up the sign in pop up. However after authorisation, how can I capture the user access token?
Any help is greatly appreciated.

Answer 1

I managed to fix the issue with the help of #CBore's comment:
Created a new route in my web.php
Route::get('linkinstagramBasic','InstagramController#linkBasic')->name('instagram.linkBasic');
Included the URL under Valid OAuth Redirect URIs on facebook app settings page.
Finally wrote the callback:
/*
* Function that works as the call back after Instagram basic display api authorisation
* Get the code and call access_token API
* AUTHOR : DON
* DATE : 12/10/2022
*/
public function linkBasic(InstagramLinkRequest $instagramRequest) {
if (isset($_GET['code'])) {
// Get the OAuth callback code
$code = $_GET['code'];
$ig_atu = "https://api.instagram.com/oauth/access_token";
$ig_data = [];
$ig_data['client_id'] = Config::get('instagram_basic.app_id');
$ig_data['client_secret'] = Config::get('instagram_basic.app_secret');
$ig_data['grant_type'] = 'authorization_code';
$ig_data['redirect_uri'] = Config::get('instagram_basic.redirect_uri');
$ig_data['code'] = $code;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $ig_atu);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($ig_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$ig_auth_data = curl_exec($ch);
curl_close($ch);
$ig_auth_data = json_decode($ig_auth_data, true);
dd($ig_auth_data);
//$accessTok = $ig_auth_data['access_token'];
//$UID = $ig_auth_data['user_id'];
//echo "<script>window.close();</script>";
}
}