Which privilege need I to view data in vbs page?

I created a vbs page that extract the customer data, but without "Application Developer" role the user can't see nothing when starts the calls. I can access to the page but when he inserts a parameter has no results and an error "BAD REQUEST". I check in the inspector page and rest api can find the customer, it seems like my user has no privilege to see the data, but if I give him application developer role, it works. The problem is that he is a basic user, can't have that role.

the rest api used are:

https://domain/fscmRestApi/rest/[...]/en/11.13.18.05:9/describe.openapi?metadataMode=minimal&resources=setIdSetshttps://domain/fscmRestApi/rest/[...]/en/11.13.18.05:9/setIdSets