Hi Mihai Socaciu it sounds like you are using your App config resource for testing (unless I missed something) and I'd like to suggest maybe to try out the Developer Tier which is suitable for testing, its $0.12 per store per day, plus an overage charge at $0.40 per 10,000 requests². The first 3,000 requests are included in the daily charge.

Please see https://azure.microsoft.com/pricing/details/app-configuration/, for more information.