feat(#904): implement multi-chain subscription management with unified billing - #1065
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…with unified billing - Add MultiChainSubscriptionService: chain bindings per subscription, unified billing statements that convert every chain into one currency while keeping native token subtotals, and settlement planning with health-aware cross-chain failover - walletService: add getBalancesAcrossChains() (parallel, per-chain error isolation) and static totalsBySymbol() keeping holdings separated by chain - Add comprehensive tests for MultiChainSubscriptionService and wallet multi-chain balance fetching - Add docs/MULTI_CHAIN_SUBSCRIPTIONS.md with full API reference Closes Smartdevs17#904
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Summary
Implements multi-chain subscription management with unified billing across Stellar and EVM chains.
Closes #904
Changes
New:
src/services/multiChainSubscriptionService.tsbuildUnifiedStatement(): converts all chain charges into one currency using injected conversion rates; unpriced tokens are reported explicitly rather than counted as zeroplanSettlement(): health-aware cross-chain payment routing with per-chain error isolationUpdated:
src/services/walletService.tsgetBalancesAcrossChains(): parallel multi-chain balance fetch with per-chain error isolationtotalsBySymbol(): holdings kept separate by chain (same symbol on two chains is not fungible)Tests
src/services/__tests__/multiChainSubscriptionService.test.ts: 313 lines of testssrc/services/__tests__/walletMultiChain.test.ts: 113 lines of multi-chain wallet testsDocumentation
docs/MULTI_CHAIN_SUBSCRIPTIONS.md: full API reference and usage examplesAcceptance Criteria
Technical Scope
Covers:
src/services/walletService.ts,contracts/subscription/src/lib.rs