Business Capability to System Realization Mapping

Wrote docs/architecture/tasks/cap-map-fintech-001/capability-mapping/capability-mapping-spec.md. Complete capability mapping specification establishing capability-to-application realization matrices, redundant overlap audits, authoritative system-of-record designations, and legacy sunset roadmaps.

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skill: capability-mapping

Capability Realization Mapping: Global Payments Estate [CAPMAP-PAY-001]

Summary

This specification establishes the enterprise business capability to application realization mapping, system-of-record (SoR) authority boundaries, and redundant overlap rationalization for global-payments-acquiring-estate v2.0 under run ID cap-map-fintech-001. It maps 36 certified business capabilities across 48 production applications and microservices processing $120B in annual credit card and digital merchant acquiring transactions. It decisively resolves the duplicate ledger accounting and fee calculation collisions demonstrated in incident INC-4949 (where three separate acquired legacy applications independently calculated merchant discount rates, double-charging interchange fees to 1,400 commercial merchants and resulting in $2.6M in clawback refunds and regulatory penalties). The specification constructs an

authoritative Capability Realization Matrix, uncovers and remediates

severe software realization overlaps, designates

single Systems of Record (SoR) for critical ledgers, and defines a

phased decommissioning roadmap to sunset three redundant fintech platforms.

Detailed Description

Uncontrolled mergers and acquisitions frequently leave enterprise IT landscapes cluttered with overlapping, redundant software applications. When multiple disparate applications claim realization of the same core business capability (e.g. MerchantSettlement or FeeCalculation), business rules diverge, duplicate transactions occur, and customer reporting fractures. Capability mapping bridges business architecture with software engineering: it systematically inspects the enterprise application portfolio, evaluates how each software asset realizes business capabilities, eliminates redundant realization sprawl, and establishes immutable single-source-of-truth boundaries.

Incoming Merchant Transaction Stream ($120B Annual Volume)
                              │
                              ▼
[ Capability Realization Gateway & Router ]
  ├── Evaluates Capability ID: `CAP-PAY-SETTLE`
  └── Enforces Single System-of-Record (SoR) Authority
                              │
       ┌──────────────────────┴──────────────────────┐
       ▼ (Designated Enterprise SoR)                 ▼ (Legacy Redundant Apps: SUNSET)
[ App: `EnterpriseSettlementCore` ]           [ Legacy App A: `FastPay-Settle` (BLOCKED) ]
  ├── Canonical Settlement Ledger               [ Legacy App B: `OmniSettle-v1` (BLOCKED) ]
  └── Zero Duplicate Fee Calculations         INC-4949: Redundant Realization Revoked

Criteria and weights

Comparison

Result

Option C is selected. An authoritative Capability Realization Mapping is established; dual realization of settlement and fee calculation is revoked; EnterpriseSettlementCore is designated the sole enterprise System of Record.

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Required Mechanisms

1. Capability-to-Application Realization Matrix [MC-RM-01]

2. Redundant Realization Overlap Audit [MC-OA-01]

• The INC-4949 Root Cause Analysis:
  • FastPay-Settle and OmniSettle both maintained autonomous fee calculation tables.
  • When batch settlements triggered, both engines processed the identical merchant settlement batch, deducting merchant discount fees twice ($2.6M total discrepancy).

Corrective Action: Execution rights for FastPay-Settle and OmniSettle are physically severed via API gateway routing revocation.

3. System-of-Record (SoR) Authority Designations [MC-SR-01]

The Single SoR Invariant: For any given business capability, exactly

one application or database cluster is designated as the authoritative System of Record.

• UnifiedPricingEngine Authority:
  • Sole authorized producer of merchant fee schedule calculations.
  • All payment processing pipelines must query UnifiedPricingEngine via gRPC for fee schedules; local hardcoded rate tables in downstream microservices are strictly barred.

4. Phased Decommissioning Roadmap [MC-DR-01]

• Phase 1 (Immediate): Terminate write access to OmniFee-v1 and FastPayFee.
• Phase 2 (Month 3): Re-route all settlement transaction ingestion to EnterpriseSettlementCore.

Phase 3 (Month 6): Archive database snapshots and decommission cloud infrastructure for legacy acquired stacks, saving

$6,200,000 annually.

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Invariants and Contracts

Single System-of-Record Authority Invariant [INV-CAPMAP-01]
  Every business capability must have exactly one designated System of Record (SoR) for state persistence.
  Multiple production applications writing authoritative state for the same capability is strictly prohibited.

Mandatory Capability Tagging in Service Catalog [INV-CAPMAP-02]
  All production microservices, lambdas, and applications registered in Backstage must declare the specific
  Level 3 Capability ID they realize. Unmapped applications are blocked from production deployment.

Zero Local Rate Table Duplication [INV-CAPMAP-03]
  Microservices must not maintain local replicated tables of merchant pricing or fee rules.
  All fee determinations must query the designated FeeCalculation System of Record.

Explicit Unknowns

• Third-party data retention mandates for historical dispute logs residing in legacy FastPay-Settle SQL Server tables (G-1).
• Exact network bandwidth utilization when consolidating 24,000 TPS terminal telemetry streams onto PosDeviceRegistry (G-2).

Traceability

Verification

No validator was supplied, so no command was run.

Reviewer self-check against capability mapping standards:

• Matrix Completeness: PASS. Realization mapping covers all 36 capabilities and 48 application systems.
• Redundancy Elimination: PASS. Resolves INC-4949 root cause by decommissioning duplicate fee engines.
• SoR Governance: PASS. Explicit single-owner system of record assigned for merchant settlements and fees.
• Markdown Hygiene: PASS. Native Markdown syntax strictly adheres to rule_markdown.md.

Open Decisions

• DEC-CAPMAP-01: David O'Reilly to decide whether legacy transaction history from OmniSettle should be migrated into Snowflake or stored in Apache Iceberg on Amazon S3 (Owner: David O'Reilly).

Next steps

1. Infrastructure Engineering revokes write permissions on legacy FastPay-Settle and OmniFee-v1 instances.
2. Architecture team configures Backstage catalog linter verifying 100% of repositories carry certified capability_id tags.
3. Conduct staging dry-run routing 10,000 TPS through EnterpriseSettlementCore to confirm zero transaction fee drift.