api - Shopify - Custom PHP app gives Missing Authorization key error

Solution:

It seems like the Shopify API for PHP expects you to (https://github.com/Shopify/shopify-api-php/blob/7a5b651d276c833101ebb7a43106e55b2e532581/src/Auth/OAuth.php#L219) set theAuthorization header field/ doesn't supportX-Shopify-Access-Token. Try this instead:

$requestHeaders = array(
                       'api_version'=>'2022-10', 
                       'Authorization'=>'Bearer YOUR_ACCESS_TOKEN'
                      );
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