How to get API Curl authorisation to work via PHP - php

Question

I am working with dr chrono API and am trying to initialized the First step which is authorisation
The API documentation is here.
Here is an Authorisation sample:
https://drchrono.com/o/authorize/?redirect_uri=REDIRECT_URI_ENCODED&response_type=code&client_id=CLIENT_ID_ENCODED&scope=SCOPES_ENCODED
Here is what I have tried:
1.) I have tried the first code below
<?php
echo "<a href='https://drchrono.com/o/authorize/?redirect_uri=https://example_site.com/return_page.php&response_type=code&client_id=myclient-id-goeshere&scope=BASE_SCOPE:[read|write]'>Authorize</a>";
?>
but when the page redirects it displays error of Invalid_scope. Below is the error link returned.
https://example_site.com/return_page.php?error=invalid_scope
2.) Using Curl
$ci = 'my-client-id-goes-here';
$ci_encode = urlencode($ci);
$uri = 'https://example_site.com/return_page.php';
$uri_encode = $uri;
$url = "https://drchrono.com/o/authorize/";
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query([
'response_type'=>'code',
'client_id'=>$ci_encode,
'redirect_uri'=>$uri_encode,
'scope'=>'BASE_SCOPE:[read|write]',
]));
$response = curl_exec($ch);
curl_close($ch);
print_r($response);
Using curl code above does even redirect me at all.
I think the major problem is the scope not properly set. How can I solve this issue?
Update
Code section for curl:
$ci = 'my-client-id';
$ci_encode = urlencode($ci);
$uri = 'https://example_site.com/return_page.php';
$uri_encode = $uri;
$url = "https://drchrono.com/o/authorize/?";
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query([
'response_type'=>'code',
'client_id'=>$ci,
'redirect_uri'=>$uri,
'scope'=>'patients:summary:read patients:summary:write calendar:read calendar:write clinical:read clinical:write'
]));
$response = curl_exec($ch);
curl_close($ch);
print_r($response);

Answer 1

Instead of BASE_SCOPE:[read|write] I would use patients:summary:read patients:summary:write calendar:read calendar:write clinical:read clinical:write
The docs say that you can choose among user, calendar, patients, patients:summary, billing, clinical and labs and compose a scope out of these values.