Facebook Fetch Product Catalog Api returning empty response on webstite but working on postman

Question

we are trying to fetch the products catalog on our website, its resutling in empty response https://websiteurl/fb/fetchfbproducts.

But, same curl and code is working on postman and in the URL formatting - its showing product with related fields

We have checked https request, token scopes, assets and what now but unable to find out why its not showing on website, when code is working on the postman.

I have checked everything token scope, permission issue and htts and other all suggested parameters.

Just for reference - this is the url structure which I am following and working on Postman.

https://graph.facebook.com/v19.0/catalogid/products?fields=imageurl,url,product_group,name,sale_price,price,id,fb_product_category,parent_product_id,retailer_id,retailer_product_group_id,category,commerce_insights,description,size,wa_compliance_category&access_token=