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Payhawk API

RESTful spend management API with webhooks for real-time expense, card, and transaction data sync to ERP systems; free with Payhawk subscription

Visit Payhawk APIVerified · March 6, 2026

✓ Our Verdict

Viable option — review the tradeoffs

Use Case

You need real-time sync of expenses, cards, and transactions from a spend management system into your ERP or custom workflows without polling delays.

SolutionPayhawk API's REST endpoints and webhooks enable pulling all records (expenses, cards, POs, suppliers) and pushing event notifications like expense.created to your endpoint.

SetupEnable API key in Payhawk portal Settings > Integrations > API Keys, copy Account ID from URL, add X-Payhawk-ApiKey header to requests, subscribe to webhooks via Create Webhook Subscription endpoint.

Reliable real-time delivery with retries on 408/429/500+ errors, signature verification required using RSA public key; rate limited to 15 req/sec which suffices for most agents.

Reliability

Use Case

You want to automate spend data export to accounting systems like NetSuite or DATEV with full fields including VAT, categories, custom fields, and splits.

SolutionPull comprehensive expense/transaction data via API endpoints and update custom fields programmatically for seamless ERP integration.

SetupAuthenticate with API key, use human-friendly API explorer for testing endpoints like Expenses, Fund Accounts, Cards.

Solid coverage of spend data fields; some ERP-specific limits like only KOST1/KOST2 for DATEV; free with subscription, no extra cost.

Completeness

Limitation — minor

ERP Field Constraints

Custom integrations to systems like DATEV via XML are limited to KOST1/KOST2 fields; no API for more fields in some cases.

Caution

Webhook Signature Verification

All webhooks require RSA SHA256 signature check using public key from /api/v2/rsa-public-key; invalid sig throws ForbiddenError—implement before processing payloads.

Prerequisite

Active Payhawk Subscription

API access requires enabled developer key which may need partner@payhawk.com contact if not visible; free but gated behind paid account.

Trust Breakdown

74

Trust scoreSolid

AGENT

Autonomous workflow delegation

TRUST

Transparency & verification

INTEROP

Protocol compatibility breadth

SECURITY

Security controls & audit trail

DOCS

Documentation completeness

How these scores are calculated →

What It Actually Does

In Plain English

Payhawk API lets you sync expense, card, and transaction data from Payhawk's spend management platform to your accounting or ERP systems in real time using webhooks. It's free if you have a Payhawk subscription.[6]

RESTful spend management API with webhooks for real-time expense, card, and transaction data sync to ERP systems; free with Payhawk subscription.

Fit Assessment

Best for

✓data-retrieval
✓webhooks

Not ideal for

✗rate limit of 15 requests per second

Known Failure Modes

rate limit of 15 requests per second

74

Payhawk API

Solid · 74/100

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Score Breakdown

AGENT

Autonomous workflow delegation

TRUST

Transparency & verification

INTEROP

Protocol compatibility breadth

SECURITY

Security controls & audit trail

DOCS

Documentation completeness

Protocol Support

MCP—

A2A—

A2H✓

REST API✓

Agent-callable—

Capabilities

Transaction capable—

ACP support—

Audit trace✓

Governance

permission-scoping
rate-limiting
audit-log

Pricing

Free

Free for all Payhawk accounts

Workflow Fit

data-retrievalwebhooks

Related Concepts

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