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Prototype !! Buckets Consume: Sink for consumed service; source for refunds Service: Current allocation for service (can go negative if customer desires, or act as access cutoff) Balance: Current customer balance not allocated for service (can go negative as consumed, or positive if prepaid) Invoice: Amount owed on current invoice !! Ticks ! Automatic Ticks * Service tick ** Service -> Consume *** Consumes a bit of Service **** once a day for daily consumption (disk, etc) **** once a month for monthly service (hosting) **** once a year for registrations (domain) **** manually, for one-time charges (setup, cleanup) * Billing tick ** Balance -> Service *** Replenish (empty or negative) Service bucket *** Move enough to cover anticipated consumption for the next billing period * Unused tick ** Service -> Balance *** Move unconsumed Service back to Balance, in case of overprovisioning or unconfigured service * Invoice tick ** Invoice -> Balance *** Bring Balance from negative to zero to account for currently owed outstanding *** Bring Invoice from positive to zero to account for overpayment * Payment tick ** Outside -> Invoice *** Incoming payments are placed here until they're accounted for by an invoice run ! Manual Ticks * Prepay tick ** Invoice -> Balance *** Preemptively move money to indicate a customer's desire to prepay by owing more on next invoice than is actually outstanding * Refund tick ** Consume -> Service *** Refund for consumed but unprovided service (outage, etc) !! Service Consumption # Generate Service tick once a day for daily consumption (disk usage) # Generate Service tick once a month for monthly consumption (hosting charges) # Generate Service tick for yearly charges (domain registration) # Manual Service tick for one-time charges !! Invoice Generation # Generate Unused tick to refund unused service # Generate Billing tick to fund next billing period # Generate Invoice tick to account for payments and refunds # Compute invoice values and lines from all relevant ticks #* Anticipated future ticks (Service ticks) #* All ticks between previous and current Invoice tick #* All ticks before previous Invoice tick that are still relevant (positive/negative balance, etc) !! Example flows * 20-Dec: January period starts December 20th * 29-Dec: New customer provisioned for $10.00 VHOST MED service * 29-Dec: Bucket balances: C:0 S:0 B:0 I:0 * 01-Jan: Service tick: $10 S->C - C:10 S:-10 B:0 I:0 * 20-Jan: February billing period starts * 20-Jan: Unused tick (none necessary) * 20-Jan: Billing tick: $10 B->S - C:10 S:10 B:-20 I:0 * 20-Jan: Invoice tick: $20 I->B - C:10 S:10 B:0 I:-20 Sample invoice: <pre> $10.00 - VHOST MED: example.com 2011-Jan $10.00 - VHOST MED: example.com 2011-Feb ---- $20.00 - Amount due </pre> * 30-Jan: Payment tick: $20 ?->I - C:20 S:0 B:0 I:0 * 01-Feb: Service tick: $10 S->C - C:20 S:0 B:0 I:0 * 20-Feb: March billing period starts * 20-Feb: Unused tick (none necessary) * 20-Feb: Billing tick: $10 B->S - C:20 S:10 B:-10 I:0 * 20-Feb: Invoice tick: $10 I->B - C:20 S:10 B:0 I:-10 <pre> $10.00 - VHOST MED: example.com 2011-Jan $10.00 - VHOST MED: example.com 2011-Feb $20.00CR - Payment received 2011-01-30, Thank you! $10.00 - VHOST MED: example.com 2011-Mar ---- $10.00 - Amount due </pre> * Customer goes delinquent! * 01-Mar: Service tick: $10 S->C - C:30 S:0 B:0 I:-10 * 20-Mar: April billing period starts * 20-Mar: Unused tick (none necessary) * 20-Mar: Billing tick: $10 B->S - C:30 S:10 B:-10 I:-10 * 20-Mar: Invoice tick: $10 I->B - C:30 S:10 B:0 I:-20 <pre> $10.00 - VHOST MED: example.com 2011-Mar $10.00 - VHOST MED: example.com 2011-Apr ---- $20.00 - Amount due </pre> * Customer requests prepay so they don't go delinquent again; next invoice should be $50 * 21-Mar: Payment tick: $20 ?->I - C:30 S:10 B:0 I:0 * 21-Mar: Prepay tick: $50 I->B - C:30 S:10 B:50 I:-50 * 01-Apr: Service tick: $10 VHOST MED - S->C - C:40 S:0 B:50 I:-50 * 20-Apr: May billing period starts * 20-Apr: Unused tick (none necessary) * 20-Apr: Billing tick: $10 B->S - C:40 S:10 B:40 I:-50 * 20-Apr: Invoice tick: $0 I->B - C:40 S:10 B:40 I:-50 <pre> $10.00 - VHOST MED: example.com 2011-Mar $10.00 - VHOST MED: example.com 2011-Apr $20.00CR - Payment received 2011-03-21, Thank you! $40.00 - Prepay request $10.00 - VHOST MED: example.com 2011-May ---- $50.00 - Amount due </pre> (Prepay request is computed as the Prepay tick(s) minus the anticipated Service tick(s). If the Prepay ticks don't cover all of the anticipated Service ticks, then adjust Invoice tick upwards to compensate and don't bother showing the Prepay tick) * 25-Apr: Payment tick: $50 ?->I - C:40 S:10 B:40 I:0 * 01-May: Service tick: $10 S->C - C:50 S:0 B:40 I:0 * 20-May: June billing period starts * 20-May: Unused tick (none necessary) * 20-May: Billing tick: $10 B->S - C:50 S:10 B:30 I:0 * 20-May: Invoice tick: $0 I->B - C:50 S:10 B:30 I:0 <pre> $40.00 - Prepay request $10.00 - VHOST MED: example.com 2011-May $50.00CR - Payment received 2011-04-25, Thank you! $10.00 - VHOST MED: example.com 2011-Jun ---- $30.00CR - Current balance </pre>
