Sale percentage

async function getCartSalePercentage() {
   const baseUrl = 'https://api.stableproxy.com/v2';
   const req = await fetch(baseUrl + '/cart/sale-percentage', {
         method: 'GET',
         headers: {
            'Content-Type': 'application/json'
         }
      }
   );
   
   const res = await req.json();
}