Auth key for fetching ledger entries
An optional fields mask
Customer ID of the customer
Buyer ID of the customer
Value of the contract duration (if contract duration is 3 years, value will be 3)
Unit of the contract duration (if contract duration is 3 years, unit will be YEAR)
Value of the billing frequency (if billing frequency is 2 months, value will be 2)
Unit of the billing frequency (if billing frequency is 2 months, unit will be MONTH)
Start date of the next billing date filter
End date of the next billing date filter
ACTIVE, DRAFT, CANCELLED, EXPIRED