Ecommerce Shopify WordPress Discussion

Shopify 401 Authentication issue Upload

I've created a private app in the Shopify Admin area. Download and upload work fine in Postman, but from my server, only the download works. When trying to upload data, I receive a 401 status code, and the shop data (categories) remain unchanged. Can anyone tell me what might be causing this? Could it be related to outdated SSL certificates, or have I missed something fundamental regarding authentication? I've attached my code (JavaScript and comments) for reference: // Produces 400 + 401 function uploadCategoriesSFY() { var settings = { "url": "", //"url": "", // Also returns a 401 "method": "POST", "timeout": 0, "headers": { "X-Shopify-Access-Token": "sh.._de1123....", //"X-Shopify-Access-Token" produces a 401 /* Fri Feb 16 15:05:05 CET 2024: API RESPONSE: { "responseCode": 401, "errorResponse": "{errors:[API] Invalid API key or access token (unrecognized login or wrong password)}" } */ "Authorization": "Basic 456..", /* * // Authorization in the header produces a 400 Fri Feb 16 15:02:30 CET 2024: API RESPONSE: { "responseCode": 400, "errorResponse": "{errors:{custom_collection:Required parameter missing or invalid}}" } */ "Content-Type": "application/json" }, "data": JSON.stringify({ "custom_collection": { "title": "SSLTEST", "body_html": "Description of the collection", "sort_order": "manual", "template_suffix": "your_template_suffix", "published_scope": "web" } }) }; } Try different combinations of my API credentials. Even basic Authentication. Same results.
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