Accounting software with API: how to choose one and build reliable integrations in the UAE and KSA
What is accounting software with an API, and who needs one?
Finance and engineering teams in the UAE and Saudi Arabia keep rebuilding the same bridge: an online store, ERP, or app creates sales and bills, and someone retypes them into the accounting system. That bridge breaks at the worst moments: duplicate invoices after a timeout, wrong tax rates on foreign currency sales, and e-invoicing rules a generic connector has never heard of. Accounting software with API access gives your own systems a documented, secure way to create and read invoices, bills, payments, journals, and bank data directly in the ledger.
This guide explains what an accounting API can do, how API keys and OAuth apps differ, how to build integrations that stay correct, how to evaluate vendors, and how Wafeq’s API works across the UAE and Saudi Arabia.
Who needs an accounting API?
You need an accounting API when another system creates financial data for the ledger, or when you build a product for the software users. The table maps the five most common cases to what the API does for each.
Who you are? | What do you need? | What the API does? |
|---|---|---|
Online store or POS operator | Every order and refund recorded as a sale, with the right tax | Creates invoices and payments as orders happen |
Business with an ERP or custom system | One ledger that reflects operations, without double entry | Syncs invoices, bills, contacts, and journals both ways |
Software platform | Accounting inside your product, for your customers | Lets customers authorize your app to read and write their books |
Fintech or bank connector | Bank and card transactions delivered into the books | Imports statement lines and creates ledger entries |
Accounting firm or developer | Repeatable automation for several clients | Runs scheduled imports, reports, and checks |
These cases share a requirement that a manual export can't meet:
These cases share a requirement that a manual export can't meet:
The integration must be repeatable, safe to retry, and traceable. That is the test to apply to every vendor, and the rest of this guide turns it into questions you can ask.
Why not just export and import spreadsheets?
Spreadsheet transfers work at low volume, but they depend on people, break on format changes, and leave no reliable trail of what was imported. An API replaces that routine with a repeatable, monitorable job.
The cost of manual transfer is rarely visible until volume grows or an auditor asks how a figure reached the ledger. A well-built integration records what was sent, when, and under which identifier, so every ledger entry can be traced back to its source.
Read also: Best cloud accounting software in the UAE: FTA compliance, bank feeds, and automation
What can an accounting API actually do?
A complete accounting API covers sales, purchases, expenses, banking, journals, reports, and the master data that links them, not just invoice creation. Check coverage against the workflows you plan to automate before you commit, because a thin API forces workarounds.
Workflow | What you can automate | What Wafeq’s API documents |
|---|---|---|
Sales and receivables | Quotes, invoices, credit notes, customer payments, invoice lifecycle | Quote-to-cash and invoice lifecycle guides, with invoice creation endpoints |
Purchases and payables | Suppliers, purchase orders, bills, debit notes, supplier payments | Purchase-to-pay guide and endpoints for bills and supplier payments |
Spend management | Expenses and receipt files | Expenses, receipt files, tax rates, accounts, projects, and cost centers |
Banking | Bank accounts, statement lines, and ledger entries | Bank accounts, statement transactions, and bank ledger transactions |
Core accounting | Chart of accounts, manual journals, branches, financial reports | Accounts, journals, branches, and reports |
Extras | Projects, cost centers, custom fields, file attachments | Dedicated guides for each |
Wafeq’s developer guide, Build with the Wafeq API, walks through these journeys end to end and links each step to the API reference.
Wafeq’s developer guide, Build with the Wafeq API, walks through these journeys end to end and links each step to the API reference.
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Read also: Enterprise payout automation in the GCC: eliminating manual AP and fraud
How do API keys and OAuth apps differ?
Use an API key for a private integration with one organization, and an OAuth app when other customers connect their own organizations to your product. Wafeq supports both, and both call the same endpoints at https://api.wafeq.com/v1. Only the way the connection is established changes.
| API key integration | OAuth app |
|---|---|---|
Best for | A private integration for your own organization | A product or platform that connects Wafeq customers |
Organizations | One organization per key | Many customer organizations |
Customer consent | Not required | Required for each connected organization |
Access | Organization-wide | Least-privilege scopes the customer grants |
Request header | Authorization: Api-Key <key> | Authorization: Bearer <access token> |
Where you manage it | API Keys in the connected Wafeq organization | The Wafeq Developer Portal |
The full setup, including redirect URIs, scopes, and token refresh, is in Wafeq’s guide to choosing an integration type and authenticating. For OAuth apps, the Developer Portal lets you seed a demo organization with sample invoices, bills, and expenses, so you can test before connecting a real customer.
How do you make your first API request?
Call the organization endpoint with your credential: a 200 response confirms the key works and tells you which accounting organization it belongs to. Store that organization alongside the credential, so records can never cross between customers.
curl "https://api.wafeq.com/v1/organization/" \
curl "https://api.wafeq.com/v1/organization/" \
--header "Authorization: Api-Key <API_KEY>" \
--header "Accept: application/json"
Your next calls usually list the IDs that documents refer to: accounts, contacts, tax rates, items, bank accounts, projects, and cost centers. List endpoints are paginated, so follow the next link until it is empty.
Read also: How to integrate e-commerce platforms with the ZATCA Fatoora portal
What should a GCC business expect from an accounting API?
A GCC business should expect local tax rates, multi-currency handling, and a clear route to e-invoicing compliance, whatever system holds the ledger. Wafeq separates the two, which avoids duplicate invoices and keeps each system’s role clear.
Option | What it does | Use it when |
|---|---|---|
Wafeq Public API | Creates and manages accounting invoices inside a Wafeq organization, with ledger posting, receivables, and reports | Wafeq is your accounting system of record |
Wafeq ZATCA API (Saudi Arabia) | A standalone Saudi Phase 2 compliance service that validates, reports, or clears invoices created elsewhere | Another ERP or POS is your system of record and you only need compliance |
Wafeq UAE e-invoicing ASP API | Sends, receives, and reports PINT AE e-invoices through an accredited provider, with a portal to onboard taxpayers | You keep your existing ERP and need UAE e-invoicing |
One rule matters in Saudi Arabia. A document submitted through the ZATCA API does not appear in Wafeq’s Sales list and does not post to the ledger, so do not recreate the same invoice in both. The distinction is explained in Wafeq Public API vs ZATCA API. For the UAE, Wafeq’s ASP API page describes how to connect an existing ERP, and the UAE e-invoicing requirements guide explains the rules your integration has to respect.
What are the compliance traps in an invoice integration?
The common traps are non-AED currencies without an exchange rate, wrong tax categories, missing customer tax numbers, and edits to invoices that were already reported. Build validation into your own system, so errors surface before the API call rather than after.
- Currency: if the invoice is not in the local currency, send the exchange rate context the API expects.
- Tax: map every product to a tax rate ID, instead of passing a percentage.
- Customers: validate tax numbers when you create the contact.
- Corrections: once an invoice is reported to the tax authority, correct it with a credit note, not an edit.
What does an invoice request contain?
An invoice request names the contact, invoice number, date, currency, tax treatment, and line items, and refers to other records by their Wafeq IDs. Wafeq’s developer page shows a request that sets the tax amount type, for example, tax exclusive, so the API knows whether line prices include VAT.
The practical consequence is that your integration needs a lookup layer. Before it sends an invoice, it must resolve the customer to a contact ID, each product to an item or account, and each tax treatment to a tax rate ID. Build that mapping once, test it with edge cases such as zero-rated sales and foreign currency, and reuse it for every document.
Read also: E-invoice management software in the UAE: what businesses need to know
How do you build an integration that stays correct?
Build for retries, timeouts, and partial failures: use two identifiers, idempotency keys on writes, selective retries, full pagination, and checkpointed incremental sync. Accounting data must be correct under failure, not just under normal conditions. Wafeq’s reliability guide sets out the pattern.
Practice | What to do | Why it matters |
|---|---|---|
Two identifiers | Store Wafeq’s ID and your own external ID in a tenant-scoped mapping table | Links each source record to the right ledger record |
Idempotent writes | Send a stable X-Wafeq-Idempotency-Key and reuse it only when retrying the same operation | A lost response never creates a second invoice |
Selective retries | Retry timeouts, 429, and most 5xx errors with backoff; do not retry 400, 401, 403, or 404 blindly | Avoids loops and duplicate side effects |
Full pagination | Follow the next link until it is empty | The first page rarely holds every record |
Incremental sync | Filter by modified timestamps, use a small overlap window, and commit checkpoints only after all pages succeed | Keeps both systems consistent without re-reading everything |
Reconciliation jobs | Check for records without a Wafeq ID, mappings that return 404, and checkpoints that stopped advancing | Makes inconsistencies visible instead of hiding them |
The detailed guidance is in Wafeq’s guide to designing a reliable integration. Webhooks are documented for the ZATCA Phase 2 API and the UAE e-invoicing portal. For the Public API, the documented approach is incremental polling with modified timestamps, so confirm any event-driven needs with Wafeq before you design around them.
How should you protect credentials and data?
Call the API only from trusted server-side infrastructure, store credentials per organization, and keep keys and tokens out of browsers, apps, and logs. A leaked account key exposes the whole organization, so treat it like a password.
- Keep API keys and OAuth secrets in a secret manager, and use separate keys per organization and environment.
- Redact Authorization headers from logs and error trackers.
- Treat an insufficient-scope 403 as a consent problem, not something to retry.
- Rotate any key that may have been exposed, and revoke the old one after traffic has moved.
Check the status of the API before you debug your own code, using Wafeq’s API status page.
Read also: Automatic bank reconciliation software for enterprises
How do you evaluate accounting software with an API?
Evaluate on coverage, authentication, documentation, test environment, reliability features, e-invoicing support, and cost, and test each with your real workflow. A short scorecard keeps vendors comparable and exposes gaps early.
Criterion | What to test | Red flag |
|---|---|---|
Object coverage | Can you create and read every object your workflow needs? | Invoices only, nothing for bills, payments, or journals |
Authentication | API keys for private use and OAuth for multi-customer apps | Shared passwords or no least-privilege scopes |
Documentation | Task-based guides with examples, plus a full reference | A reference with no workflow guidance |
Test environment | Demo organization or trial workspace with realistic data | Only live data to test on |
Idempotency | A header that makes writes safe to retry | Retries can create duplicates |
Filters and paging | Modified-timestamp filters and complete pagination | No way to sync incrementally |
Events | Webhooks or a documented polling pattern | Neither, so every change requires a full re-read |
Status and support | A public status page and a route to a human | No visibility during incidents |
E-invoicing | A documented route for your country’s rules | Compliance left to a third party you must find yourself |
Cost | Which plans include API access and any per-document fees | Pricing you only learn after building |
Use the API reference to check each object against your workflow, and put plans and entitlements side by side for every vendor on your shortlist.
Read also: Wafeq compared with Zoho Books: plans, features, and e-invoicing
Direct API, prebuilt integration, or unified API: which route fits?
Use a prebuilt integration when one exists, a direct API when you need control, and a unified API for many accounting systems. Each route trades control against speed, and mixing them is common.
Route | Strength | Watch for |
|---|---|---|
Prebuilt integration | Fastest; no code, and maintained by the vendor | Covers only the tools the vendor has built |
Direct API | Full control of data and workflow | You own error handling, retries, and upkeep |
Unified API from a third party | One build covers many accounting systems | Normalized models may hide system-specific fields, and you add another vendor |
Before you write code, check whether the tool you use already connects. Wafeq lists payments, banking, HR, inventory, and analytics tools in its integrations directory.
Read also: Best bookkeeping software for accountants in UAE and KSA
What does it cost to use the Wafeq API?
API access comes with your Wafeq plan, with an e-invoicing API on Plus and an advanced ERP API on Enterprise. Wafeq’s UAE plans start at AED 69 per month, or AED 57 per month billed annually, and prices exclude VAT. Standalone UAE e-invoicing is priced per taxpayer.
Plan | Monthly price | Annual billing | API-related features |
|---|---|---|---|
Starter | AED 69 | AED 57/month | Core accounting and bank integration |
Plus | AED 99 | AED 80/month | Adds the e-invoicing API |
Premium | AED 249 | AED 200/month | Adds consolidated reports and unlimited users |
Enterprise | Custom | Custom | Advanced ERP API and dedicated support |
Confirm which plan covers the Public API for your use case on the pricing page. For the standalone UAE e-invoicing service, Wafeq lists sandbox use as free and live plans from AED 89 per taxpayer per month, so check current terms before you budget.
Read also: Webinar: how accounting firms can eliminate month-end chaos and reclaim 10+ hours per client
How do you get started with the Wafeq API?
Start in six steps: open a workspace, create a key, call the organization endpoint, list IDs, send a test invoice, and add retries. A free trial workspace is enough to test, so you can build before you commit.
- Open a workspace. Use a free trial or your own organization, and choose the organization you want the integration to work in.
- Create an API key. In the Wafeq application, open API Keys, create a key, and store it in a secret manager.
- Call the organization endpoint. Confirm the key works and note the organization it returns.
- List your IDs. Fetch accounts, contacts, tax rates, items, and bank accounts, following pagination to the end.
- Create a test invoice. Send an invoice with a stable idempotency key, and check that it appears in the Sales list.
- Add retries and monitoring. Apply the reliability patterns, then connect production data.
What should you test before going live?
Test the failure cases, not only the happy path: retried requests, foreign-currency invoices, credit notes, long result lists, expired credentials, and rate limiting. These are the cases that corrupt books in production, and each takes minutes to test.
- Send the same create request twice with one idempotency key, and confirm only one invoice exists.
- Create a foreign-currency invoice and a credit note, and confirm they post correctly.
- Fetch a list with more than one page, and confirm every record arrives.
- Rotate a key and confirm the integration alerts instead of looping.
- Simulate a 429 response and confirm it backs off and retries with the same key.
Read also: Transform your business finances with Wafeq and Wio: a seamless integration
Read also: Build on Wafeq: tools, docs, and the developer portal
Accounting software with API access is only as useful as the integration you can build on it. Look for broad object coverage, clear authentication for private and multi-customer use, documented patterns for retries and sync, a test environment, and a route to e-invoicing in your country.
Then build as if every request will fail once: idempotency keys on writes, two identifiers per record, complete pagination, and checkpoints you commit only when a run succeeds. Test with your own workflow before you commit, and keep compliance documents and accounting records in one place so that your finance team and your engineers read the same story.
FAQs about accounting software with an API
What is an accounting API?
An accounting API is a documented interface that lets other software create, read, and update accounting records such as invoices, bills, payments, and journals. It replaces manual exports and retyping with a repeatable, traceable connection.
Does Wafeq have a public API?
Yes, Wafeq has a REST Public API at api.wafeq.com/v1 with API key and OAuth authentication, plus separate services for Saudi and UAE e-invoicing. The developer documentation includes task-based guides and an API reference.
Can customers connect my app to their Wafeq account?
Yes, through an OAuth app registered in the Wafeq Developer Portal, where each customer organization grants only the scopes your app needs. You can test with a demo organization before connecting a real customer.
How do I avoid creating duplicate invoices?
Send a stable idempotency key with every create request and reuse it only when retrying the same operation, then store the returned Wafeq ID. Do not create a second invoice just because the first response was lost.
Can I use the Wafeq API only for e-invoicing?
Yes, if your accounting lives elsewhere: the ZATCA API covers Saudi Phase 2, and the UAE ASP service adds e-invoicing to your ERP. These do not create accounting entries in Wafeq.
Is there a test environment?
Yes: OAuth apps seed a demo organization, API-key integrations use a trial workspace, and the UAE ASP portal has a free sandbox. Always keep test and production connections separate.
How do I find out if the API is down?
Check Wafeq’s public API status page first, then your own logs, which should record request IDs, status codes, latency, and the idempotency key. That separates a platform incident from a bug in your integration.
Does the API support attachments and custom fields?
Yes, Wafeq documents guides for working with files and attachments and for custom fields, so you can attach receipts and carry your own data. Check the guides to see which objects accept them.
Can I tag documents by project or cost center?
Yes, accounts, projects, and cost centers are API objects, so documents can be tagged by project or cost center when you create them. Wafeq’s guide on tracking projects, cost centers, and custom data explains the pattern.
Does the API work for both the UAE and Saudi Arabia?
Yes, the Public API serves organizations in both countries, with separate ZATCA and UAE e-invoicing services for each country’s rules. Create credentials per organization and keep Saudi and UAE connections apart.
Build on the ledger your users already run.
Build on the ledger your users already run.
Register an app in the Wafeq developer portal, or create an API key for your own integration, and connect your store, ERP, or product to invoices, bills, payments, and bank data. Start with a free trial and a test invoice.
[Start building with the Wafeq API]
