Hi Thomas
In your case, Customer is paying full amount in advance i.e. your billing is done in advance and services are to be provided in future during the contract validity period. So revenue will be recognized periodically in future after billing is done initially.
Hence Process 8 Time based and billing related revenue recognition will be applicable in this scenario.
Flow would be
VA41/VA01 - VF01 - VF44
Regards
Atul