See Merchants' Billing

post https://secure.nmi.com/api/v4/billing/reports

❗️
Never Use Real API Keys
Never use real API Keys when testing. The gateway allows Partners to create Test Merchant Accounts. Testing should always use keys from the Test Accounts and never keys from a Standard Account.

Usage

This will let you see what billing has occurred on merchants under your partner account. Billing reports are for Bill to Affiliate partners only. For Bill to Merchant partners, you will likely want commission and bill to me reports.