Walmart api claiming "Invalid item or quantity. You will be redirected to Walmart shortly." How do I fix that?

Question

So I noticed in the api there's a addToCartUrl which allows you to add that item to walmart's cart and I use code to do that for multiple items:

function buyIt() {
//window.open('http://c.affil.walmart.com/t/api02?l=http%3A%2F%2Faffil.walmart.com%2Fcart%2FaddToCart%3Fitems%3D' + product.itemId + '%7C1%26affp1%3DM1u8aZZoZbep0p3P7hVn_sT4Ry97xPSOvnILkAKRCH8%26affilsrc%3Dapi%26veh%3Daff%26wmlspartner%3Dreadonlyapi')
//cs.productLink = '';

if(cs.cartItemIds.length == 1){
  window.open("http://c.affil.walmart.com/t/api02?l=http%3A%2F%2Faffil.walmart.com%2Fcart%2FaddToCart%3Fitems%3D" + cs.cartItemIds[0] + "%7C1%26affp1%3DM1u8aZZoZbep0p3P7hVn_sT4Ry97xPSOvnILkAKRCH8%26affilsrc%3Dapi%26veh%3Daff%26wmlspartner%3Dreadonlyapi");

}
else{
  for(var i = 0; i<(cs.cartItemIds.length - 1); i++){
    console.log(cs.cartItemIds.length);
    console.log(cs.cartItemIds);
    //alert('http://c.affil.walmart.com/t/api02?l=http%3A%2F%2Faffil.walmart.com%2Fcart%2FaddToCart%3Fitems%3D' + cs.cartItemIds[i]+ '%7C1%26affp1%3DM1u8aZZoZbep0p3P7hVn_sT4Ry97xPSOvnILkAKRCH8%26affilsrc%3Dapi%26veh%3Daff%26wmlspartner%3Dreadonlyapi')
    $http.get("http://c.affil.walmart.com/t/api02?l=http%3A%2F%2Faffil.walmart.com%2Fcart%2FaddToCart%3Fitems%3D" + cs.cartItemIds[i] + "%7C1%26affp1%3DM1u8aZZoZbep0p3P7hVn_sT4Ry97xPSOvnILkAKRCH8%26affilsrc%3Dapi%26veh%3Daff%26wmlspartner%3Dreadonlyapi", {}).storage;
    //window.open('https://www.walmart.com/cart/?affilsrc=api&affp1=M1u8aZZoZbep0p3P7hVn_sT4Ry97xPSOvnILkAKRCH8&wmlspartner=readonlyapi&sourceid=api0298ae3c8c842840409172f10b2bfb579d&veh=aff');

  }
  window.open("http://c.affil.walmart.com/t/api02?l=http%3A%2F%2Faffil.walmart.com%2Fcart%2FaddToCart%3Fitems%3D" + cs.cartItemIds[cs.cartItemIds.length - 1] + "%7C1%26affp1%3DM1u8aZZoZbep0p3P7hVn_sT4Ry97xPSOvnILkAKRCH8%26affilsrc%3Dapi%26veh%3Daff%26wmlspartner%3Dreadonlyapi");

}

}

Now that will iterate through and put the corrolating link with the product but when I run the get request and it takes me to the page it only shows one item in the walmart's cart and it gives me this error on my app page

"Invalid item or quantity. You will be redirected to Walmart shortly."