Regarding Developer account in square

Hi i have create two Application as you see in above picture (Test,Test2) both have different tokens, but returning same data , what is the use of creating multiple APPLICATIONS under same account

You’re correct that they both will access your Square account, and thus get the same information. You could create different applications to just separate out specific purposes (like your online application versus your in-person application), but even that is optional and not mandatory.