feat(#906): implement usage-based billing with metered pricing and tiered overages - #1067
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…cing and tiered overages - backend/services/billing/metering.ts: pure rating engine supporting flat, graduated, volume, and package pricing with included-unit proration, minimum charges, and spend caps - contracts/metering/src: add register_tiered_meter(), quote_usage(), PricingModel/PriceTier ladder with per-tier charge breakdowns - Existing register_meter() unchanged (registers a flat meter) - Off-chain and on-chain rating implement identical arithmetic for consistency between client estimates and on-chain settlement - 391 lines of tests covering all pricing model paths - docs/USAGE_BASED_BILLING.md with API reference and examples Closes Smartdevs17#906
…e-based-billing-metered-pricing
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Summary
Implements usage-based billing with metered pricing and tiered overage rating.
Closes #906
Changes
backend/services/billing/metering.ts(new)Pure off-chain rating engine supporting four pricing models:
Features: included-unit proration, minimum charges, spend caps, per-tier charge breakdowns.
contracts/metering/src/(updated)register_tiered_meter(): on-chain tiered meter registrationquote_usage(): on-chain usage quote returning per-tier breakdownPricingModel/PriceTiertypes in the contractregister_meter()unchanged — now registers a flat meterTests
backend/services/billing/__tests__/metering.test.ts: 391 lines covering all pricing model paths, edge cases, and spend cap enforcementcontracts/metering/src/test.rs: extended test suite for tiered contract functionsDocumentation
docs/USAGE_BASED_BILLING.md: full API reference, pricing model examples, migration guideAcceptance Criteria
Technical Scope
Covers:
contracts/metering/src/,backend/services/billing/metering.ts