Hey, 
      I am working on a system which needs to get invoices from 100s of Zoho Accounts and validate their invoices and send mail to them. I have their Developer Console's Client_ID Client_Secret but when i need to get their invoices i need. auth_token which can be generated using Client_ID Client_Secret and Organization_id but we need permission accesss from the client on their account opened browser which is not possible in our case, Can i have some method where i can access their invoice with auth_token refresh_token only with client_id Client_secret etc , without any permission access...