Oanda API v20 requests failing - php

Question

I have tried the following code and receive a message saying my particular request is not supported, I cannot find any solutions that are not python for the v20 api. any help would be appreciated on what to use or where im going wrong
My error message is:
{"errorMessage":"Requested HTTP method is not supported for supplied
endpoint."}
<?php
$ch = curl_init();
$vars = "price=B&granularity=M5&count=20";
curl_setopt($ch, CURLOPT_URL,"https://api-fxpractice.oanda.com/v3/instruments/EUR_USD/candles");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,$vars); //Post Fields
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$headers = [
'Content-Type: application/json',
'Authorization: Bearer access-token',
];
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$server_output = curl_exec ($ch);
curl_close ($ch);
print $server_output ;
?>
My goal here is to successfully connect and get the response from the endpoint containing data. I have no python experience which is why im trying curl or even a javascript solution would work. Am i just not understanding this API at all?

Answer 1

Two things that stand out in the code are:
that there is no actual authorisation code. I don’t know if you have removed it for security while posting, or if you don’t realise you need to create a practice account and get an authorisation code for it? Both are free.
Your code curl_setopt($ch, CURLOPT_POST, 1); suggests you are trying a POST, whereas a GET is required for the \instruments endpoint.
But the simplest thing I can suggest that might help is to look at the following Github bash script that has taken OANDA's V1 API bash cURL example, and updated it for the v2 rest API.
https://github.com/p-burke/oanda-REST-v2-API-bash-script