Billing Behaviour

Billing starts on order

Billing for a product starts immediately when the order is placed. CMP uses the configured payment type, billing cycle, and billing rule. No separate activation step is required for billing to begin.

Documentation in progress — Contract billing

Contract billing can be enabled per product (product-specific). Full documentation for contract billing behaviour, customer flow, and admin configuration is in progress and will be added in a later update.

Order → billing flow

When a customer places an order:

1. Product, price, billing rule, and cycle are stored
2. Service / offering records are created for the order
3. An invoice is generated using the billing rule (including pro-rata when applicable)
4. start_at, end_at, and renew_at are calculated

Product & order billing examples (monthly)

Common product: Linux Managed Service — monthly price ₹1,000, billing cycle Monthly. Rule varies per example.

1. FIXED_PRORATA (default — most important)

Order date: 10 Feb · Rule: Fixed Pro-Rata

Invoice	Period	Amount
First	10 Feb → 28 Feb (19 days)	Daily = 1000 ÷ 30.5 ≈ 32.79 → ₹623
Next	1 Mar → 31 Mar	₹1,000

First invoice = partial month; later invoices = full calendar months.

2. UNFIXED_PRORATA

Order date: 10 Feb · Rule: Unfixed Pro-Rata

Invoice	Period	Amount
First	10 Feb → 28 Feb	₹623 (pro-rata)
Next	1 Mar → 31 Mar	₹1,000

Looks similar monthly; differences show more clearly on quarterly/yearly cycles.

3. DATE_TO_DATE

Order date: 10 Feb · Rule: Date-to-Date

Invoice	Period	Amount
First	10 Feb → 9 Mar	₹1,000
Next	10 Mar → 9 Apr	₹1,000

No pro-rata — always the same date-aligned cycle.

4. FIXED_CALENDAR_MONTH

Order date: 20 Feb · Rule: Fixed Calendar Month

Invoice	Period	Amount
First	1 Feb → 28 Feb	₹1,000 (full)
Next	1 Mar → 31 Mar	₹1,000

No pro-rata — full charge even for partial calendar usage in the first month.

5. UNFIXED_CALENDAR_MONTH

Order date: 20 Feb · Rule: Unfixed Calendar Month

Invoice	Period	Amount
First	20 Feb → 28 Feb	Pro-rata ≈ ₹295
Next	1 Mar → 31 Mar	₹1,000

First month adjusted; then full calendar months.

Summary

Rule	First invoice	Next cycle	Pro-rata
FIXED_PRORATA	Partial	Calendar	Yes
UNFIXED_PRORATA	Partial	Calendar	Yes
DATE_TO_DATE	Full	Same date	No
FIXED_CALENDAR_MONTH	Full	Calendar	No
UNFIXED_CALENDAR_MONTH	Partial	Calendar	Yes

Important customer scenario (deletion)

Example: customer orders on 15 Jan, deletes on 20 Mar, rule FIXED_PRORATA:

Month	Charge
Jan	Pro-rata
Feb	Full
Mar	Full (even if deleted on 20 Mar)

March is still full because the invoice for that calendar month was already generated.

Related

• Product Billing
• Add Products
• Pricing Formulas
• Orders