How to get full data for salesperson in Zohobook

How to get full data for salesperson in Zohobook

Hi, 
I'm trying to get full data for salesperson but can't do it
I see we can using some ways

  1. salesperson = zoho.books.getRecords("salespersons",organization_id, "zoho_books");

  3. salesperson = zoho.books.getRecordsByID("salespersons",organization_id,salesperson_id,"zoho_books");

  5. params = Map();
  6. params.put("organization_id",organization_id);
  7. params.put("responseFormat","json");
  8. response = invokeurl
  9. [
  10. url :"https://books.zoho.com/api/v3/salespersons"
  11. type :GET
  12. parameters:params
  13. connection:"zoho_books"
  14. ];
it will return

  1. "code": 57,
  2. "message": "You are not authorized to perform this operation"
  3. }
  4. zoho code": 14, "message": "The request could not be authenticated as the authentication value you entered is invalid. Enter a valid authentication value and try again 
My zoho_books  connections: 

  1. ZohoBooks.accountants.All
  2. ZohoBooks.bills.All
  3. ZohoBooks.contacts.All
  4. ZohoBooks.custommodules.ALL
  5. ZohoBooks.estimates.All
  6. ZohoBooks.fullaccess.all
  7. ZohoBooks.invoices.All
  8. ZohoBooks.items.All
  9. ZohoBooks.salesorders.All

Do you know which type of scope should I choose?
Another question is how can I get the custom fields of a salesperson?
Thanks