How does application development work and how does development affect the cost of the application? What does it depend on? I want to develop my own application and I don't know if I have enough budget. Is there any way to calculate the cost of developing an application in advance?

I tried retrieve the records from my list and then try "updateitem" with Data Extension inside
but it's not working

 

<script runat="server">
 
    Platform.Load("core", "1");
 
    var api = new Script.Util.WSProxy();
 
 try {
 
 var res = api.retrieve("ListSubscriber", 
    ["SubscriberKey"],
    {
        Property: "ListID",
        SimpleOperator: "equals",
        Value: "xxxx"
    }
);
   
   var options = {
 SaveOptions: [
  {
   PropertyName: 'SubscriberKey',
   SaveAction: 'UpdateAdd'
  }
 ]
};
   var result = api.updateItem('Subscriber', {
 CustomerKey: "XXXXXXX-XXXXX-XXXXX-XXXXX"
 
}, options);
 Write(Stringify(res));
  
 } catch(error) {
  Write(Stringify(error));
 }
 
</script>

My web page returns the subscribers but do not update my Data Extension, any help about my code is useful, thanks in advance!

I am running a e com store and just created the website. Now my business is growing and i want to make mobile app of best japanese vegetable knives (https://toolsofchef.com/best-japanese-vegetable-knives/) my store. Is there a developer here who can tell me how much it would cost to build a mobile app?

Hi All,
Please help me with integrating square online payment to salesforce. I referred square developer portal, 
https://docs.connect.squareup.com/
https://squareup.com/help/us/en/article/3853-square-api 
if you share knowledge on this much appreciated.

Thanks,
Palani

I am running a e com store and just created the website. Now my business is growing and i want to make mobile app of best japanese vegetable knives (https://toolsofchef.com/best-japanese-vegetable-knives/) my store. Is there a developer here who can tell me how much it would cost to build a mobile app?