# ERP Ledger Sync API

*/Software/ERP_Ledger_Sync_API*

## Solution Overview

ERP Ledger Sync API exposes a unified REST endpoint that accepts raw financial transaction payloads and commits them as balanced, double-entry journal records in legacy enterprise resource planning systems like NetSuite and SAP. The API enforces accounting logic at the ingestion layer, translating flat JSON events into the specific chart-of-accounts schema required by the target ledger. It produces a persistent, auditable transaction ID mapping the source event to the final ERP database row.

Fintech infrastructure developers and engineering teams building autonomous accounting agents consume this API to bypass the brittle, SOAP-heavy integrations typical of legacy financial software. Instead of writing custom middleware to handle API rate limits and session token rotation for every unique ERP instance, engineering teams send a single standard payload. When a transaction violates accounting rules or attempts to post to an invalid ledger account, the API diverts the payload to an exception queue for manual review by a human financial controller.

Operating strictly as a headless primitive, the API sits between modern autonomous agents and the underlying financial system of record. Upstream AI workers post their completed billing tasks to the API, which in turn queries the ERP to validate account balances and currency exchange rates before finalizing the journal entry. This separation allows services-as-software engines to execute financial workflows continuously without needing direct credentials or complex translation logic for the core ledger.

## Headless Saas Data Model

**Entities**:
- Name: JournalEntry · Description: A balanced, double-entry transaction record synced to an ERP system
- Name: LedgerLine · Description: An individual debit or credit line item belonging to a JournalEntry
- Name: ExceptionEvent · Description: A diverted payload that violated accounting rules or encountered sync errors
- Name: ChartOfAccount · Description: The specific ledger account schema required by the target ERP
- Name: ErpConnection · Description: Configuration and authentication state for a specific ERP instance
- Name: Workspace · Description: The tenant container isolating ERP configurations and financial records
**Relations**:
- To: JournalEntry · From: Workspace · Label: owns · Cardinality: one-to-many
- To: JournalEntry · From: ErpConnection · Label: syncs to · Cardinality: one-to-many
- To: LedgerLine · From: JournalEntry · Label: contains · Cardinality: one-to-many
- To: LedgerLine · From: ChartOfAccount · Label: classifies · Cardinality: one-to-many
- To: ChartOfAccount · From: ErpConnection · Label: provides schema for · Cardinality: one-to-many
- To: ErpConnection · From: Workspace · Label: configures · Cardinality: one-to-many
- To: ExceptionEvent · From: JournalEntry · Label: triggers · Cardinality: one-to-one
**Tenant Anchor**: Workspace
**Primary Resource**: JournalEntry

## Api Definition

**Protocols**:
- REST
- SDK
- MCP
- Webhooks
**Consumed By**:
- [Accounts Payable Agent](/Agents/Accounts_Payable_Agent)
- [Billing Reconciliation Agent](/Agents/Billing_Reconciliation_Agent)
- [Month-End Close Agent](/Agents/Month-End_Close_Agent)
**Integrations**:
- [NetSuite](/Products/NetSuite)
- [SAP](/Products/SAP)
**Consumption Model**: An agent connects via the MCP server to call the commit_balanced_journal tool for each processed invoice, then listens to the journal.synced webhook to confirm the remote ERP post succeeded.
**Workflow Wrappers**:
- Name: Commit Balanced Journal · Wraps: Validates double-entry logic, translates flat payloads to ERP schema, and posts the journal.
- Name: Sync Chart of Accounts · Wraps: Fetches the latest ledger schema from the target ERP and updates local validation rules.
- Name: Replay Exception Event · Wraps: Applies controller corrections to a diverted payload and re-attempts the underlying ERP sync.

## Api Function Cascade

**Ai Role**: AI operates completely in the background as a stateless mapping layer, using one-shot generative extraction to translate flat generic payloads into rigid NetSuite and SAP schemas while deterministic code handles validation and API execution end-to-end, raising exceptions to a human controller only upon a rejected remote ERP post.
**Cascade**:
- Kind: Code · Note: Accepts flat journal payloads from upstream agents via MCP. · Step: Ingest Journal Payload · Verb: ingest · Realizes: Receive Ledger Data · Oversight: none
- Kind: Code · Note: Deterministically checks debits against credits for strict equality. · Step: Validate Double Entry · Verb: validate · Realizes: Verify Account Balances · Oversight: none
- Kind: Generative · Note: Maps flat dimensions to strict NetSuite or SAP account schemas. · Step: Translate To ERP Schema · Verb: translate · Realizes: Map Ledger Accounts · Oversight: none
- Kind: Code · Note: Fires API request to ERP; flags controllers on remote rejection. · Step: Post To ERP Integration · Verb: post · Realizes: Update General Ledger · Oversight: review-on-exception
- Kind: Code · Step: Emit Sync Webhook · Verb: emit · Realizes: Broadcast Event Data · Oversight: none
**Optimizes**:
- [Ledger Sync Success Rate](/Metrics/Ledger_Sync_Success_Rate)
- [ERP Post Latency](/Metrics/ERP_Post_Latency)
- [Schema Mapping Accuracy](/Metrics/Schema_Mapping_Accuracy)
- [Exception Resolution Time](/Metrics/Exception_Resolution_Time)

## Headless Saas Representative Offer

**Warranty**: Backed by a 99.9% API availability SLA with automated payload dead-lettering and replay guarantees in the event of upstream ERP vendor downtime.
**Price Band**: ~$0.02 to $0.10 per successfully committed journal entry, depending on monthly volume
**Pricing Kind**: UsageMeter
**Deliverables**:
- Access to the ERP Ledger Sync REST API and MCP server tools
- Continuous Chart of Accounts schema validation and synchronization
- Bi-directional data translation bridging flat payloads to NetSuite and SAP schemas
- Real-time webhook notifications for journal commit statuses
- Exception queue access for managing and replaying diverted payloads
**Delivery Mode**: Self-serve API provisioning where the buyer signs up, retrieves access tokens for the MCP server or REST endpoints, and consumes the integration immediately.
**Business Function**: ProvideService
**Agent Checkout Support**:
- agentic-commerce-protocol
- stored-credential

## Headless Saas Crud Surface

**Auth Model**: API Key
**Endpoints**:
- GET /journal-entries — list journal entries
- POST /journal-entries — create a journal entry
- GET /journal-entries/{id} — fetch a specific journal entry
- PATCH /journal-entries/{id} — update a journal entry
- POST /journal-entries/{id}/sync — push the journal entry to the remote ERP
- GET /journal-entries/{journalEntryId}/ledger-lines — list ledger lines for a journal entry
- POST /journal-entries/{journalEntryId}/ledger-lines — add a ledger line to a journal entry
- GET /journal-entries/{journalEntryId}/ledger-lines/{id} — fetch a specific ledger line
- PATCH /journal-entries/{journalEntryId}/ledger-lines/{id} — update a ledger line
- GET /journal-entries/{journalEntryId}/exception-events — list exception events for a journal entry
- POST /journal-entries/{journalEntryId}/exception-events — log an exception event for a journal entry
- GET /journal-entries/{journalEntryId}/exception-events/{id} — fetch a specific exception event
- PATCH /journal-entries/{journalEntryId}/exception-events/{id} — update the resolution status of an exception event
- GET /erp-connections/{erpConnectionId}/chart-of-accounts — list chart of accounts for an ERP connection
- POST /erp-connections/{erpConnectionId}/chart-of-accounts — create a chart of account mapping
- GET /erp-connections/{erpConnectionId}/chart-of-accounts/{id} — fetch a specific chart of account
- PATCH /erp-connections/{erpConnectionId}/chart-of-accounts/{id} — update a chart of account mapping
- GET /erp-connections — list ERP connections
- POST /erp-connections — create an ERP connection
- GET /erp-connections/{id} — fetch a specific ERP connection
- PATCH /erp-connections/{id} — update an ERP connection
- GET /workspaces — list workspaces
- POST /workspaces — create a workspace
- GET /workspaces/{id} — fetch a specific workspace
- PATCH /workspaces/{id} — update a workspace
**Multitenancy**: Row-level isolation
**Webhook Events**:
- journal_entry.synced
- journal_entry.sync_failed
- exception_event.triggered
- exception_event.resolved
- erp_connection.disconnected

## Headless Saas Erd

```mermaid
erDiagram
    Workspace {
        UUID id PK "Tenant Key"
        VARCHAR name
        TIMESTAMP createdAt
    }
    JournalEntry {
        UUID id PK
        UUID workspaceId FK
        UUID erpConnectionId FK
        VARCHAR sourceEventId
        VARCHAR syncStatus
        VARCHAR remoteErpId
    }
    LedgerLine {
        UUID id PK
        UUID journalEntryId FK
        UUID chartOfAccountId FK
        DECIMAL amount
        VARCHAR entryType
    }
    ExceptionEvent {
        UUID id PK
        UUID journalEntryId FK
        VARCHAR errorCode
        JSONB rawPayload
        VARCHAR resolutionStatus
    }
    ChartOfAccount {
        UUID id PK
        UUID erpConnectionId FK
        VARCHAR accountCode
        VARCHAR accountName
        VARCHAR accountCategory
        BOOLEAN isActive
    }
    ErpConnection {
        UUID id PK
        UUID workspaceId FK
        VARCHAR providerType
        JSONB connectionConfig
        BOOLEAN isConnected
    }
    Workspace ||--o{ JournalEntry : "owns"
    ErpConnection ||--o{ JournalEntry : "syncs to"
    JournalEntry ||--o{ LedgerLine : "contains"
    ChartOfAccount ||--o{ LedgerLine : "classifies"
    ErpConnection ||--o{ ChartOfAccount : "provides schema for"
    Workspace ||--o{ ErpConnection : "configures"
    JournalEntry ||--|| ExceptionEvent : "triggers"
```

## Neighborhood

### Composed into

- [Coolerengine](/Startups/Coolerengine) — composes · Startups
- [Transaction Triage Agent](/Agents/Transaction_Triage_Agent) — composes · Agents
- [Ledger Intake Agent](/Services/Ledger_Intake_Agent) — composes · Services
- [Shipperhaven](/Startups/Shipperhaven) — composes · Startups
- [Accounts Payable Agent](/Agents/Accounts_Payable_Agent) — composes · Agents

### What it uses

- [Sap](/Products/Sap) — uses · Products
- [NetSuite](/Software/NetSuite) — uses · Software

### Optimizes

- [Ledger Sync Success Rate](/Metrics/Ledger_Sync_Success_Rate) — optimizes · Metrics
- [Schema Mapping Accuracy](/Metrics/Schema_Mapping_Accuracy) — optimizes · Metrics
- [ERP Post Latency](/Metrics/ERP_Post_Latency) — optimizes · Metrics
- [Exception Resolution Time](/Metrics/Exception_Resolution_Time) — optimizes · Metrics

### Who consumes this

- [Billing Reconciliation Agent](/Agents/Billing_Reconciliation_Agent) — consumed by · Agents
- [Month-End Close Agent](/Agents/Month-End_Close_Agent) — consumed by · Agents

### Similar Software

- [Ledger Sync API](/Software/Ledger_Sync_API) — similar · Software
- [Accounting API](/Software/Accounting_API) — similar · Software
- [Journal Posting Endpoint](/Software/Journal_Posting_Endpoint) — similar · Software
- [Transaction Sync API](/Software/Transaction_Sync_API) — similar · Software
- [Ledger Reconciliation API](/Software/Ledger_Reconciliation_API) — similar · Software
- [Ledger Close Orchestration API](/Software/Ledger_Close_Orchestration_API) — similar · Software
- [Accounting General Ledgers](/Resources/Client_financial_data/Software/Accounting_General_Ledgers) — similar · Software
- [Core Banking Systems](/Resources/Client_financial_data/Software/Core_Banking_Systems) — similar · Software
- [General Ledger Software](/Metrics/Number_of_journal_entries_per_FTE_that_performs_the_process_"perform_general_accounting"/Software/General_Ledger_Software) — similar · Software
- [Invoice Reconciliation API](/Software/Invoice_Reconciliation_API) — similar · Software
- [Enterprise Resource Planning](/Metrics/Cycle_time_in_days_to_generate_complete_and_correct_billing_data/Software/Enterprise_Resource_Planning) — similar · Software
- [Bank Feed API](/Software/Bank_Feed_API) — similar · Software

### Similar Agents

- [Multi-Ledger Sync API](/Agents/Multi-Ledger_Sync_API) — similar · Agents
- [Receipt Extraction API](/Agents/Receipt_Extraction_API) — similar · Agents
- [Ledger Resolution Engine](/Agents/Ledger_Resolution_Engine) — similar · Agents
- [Ledger Ingestion Agent](/Agents/Ledger_Ingestion_Agent) — similar · Agents

### Similar Startups

- [Accountancyfabric](/Startups/Accountancyfabric) — similar · Startups
- [Bookkeepercode](/Startups/Bookkeepercode) — similar · Startups
- [Accountantsync](/Startups/Accountantsync) — similar · Startups