Zoho books Integration API related queries

1. When we are doing first time sync we only wish to bring only outstanding Invoices from invoices api. Which filter should we pass in API to achieve the same? In subsequent syncs we want to get new outstanding and newly closed invoices.

2. In first time sync we are facing issues on API limits imposed on Zoho accounts. Is there way to bypass the API limits for kapittx subscribers who has Zoho accounts? Once of our users told us that if we publish app in Zoho Marketplace then we get unlimited API calls? Can you elaborate on the same?