Microsoft SPLA is a monthly subscription program where you report usage in arrears at the end of each month. You must report usage if you have started using the SPLA keys for your customers.
If you have signed the contract but is yet to go into production, you can report "zero usage" to rhipe for the first six months. After the first six months, you must report a minimum revenue each month.
Please contact your rhipe Account Manager for more information. Also, you must refer to the latest Service Provider Use Rights document for detailed information.