Zoho Books

Access the Zoho Books API with managed OAuth authentication. Manage invoices, contacts, bills, expenses, sales orders, purchase orders, and other accounting data with full CRUD operations.

Quick Start

# List contacts
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/zoho-books/books/v3/contacts')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Base URL

https://gateway.maton.ai/zoho-books/books/v3/{endpoint}

The gateway proxies requests to

www.zohoapis.com/books/v3

and automatically injects your OAuth token.

Authentication

All requests require the Maton API key in the Authorization header:

Authorization: Bearer $MATON_API_KEY

Environment Variable: Set your API key as

MATON_API_KEY

export MATON_API_KEY="YOUR_API_KEY"

Getting Your API Key

Sign in or create an account at maton.ai
Go to maton.ai/settings
Copy your API key

Connection Management

Manage your Zoho Books OAuth connections at

https://ctrl.maton.ai

List Connections

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections?app=zoho-books&status=ACTIVE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create Connection

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'app': 'zoho-books'}).encode()
req = urllib.request.Request('https://ctrl.maton.ai/connections', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get Connection

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections/{connection_id}')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "connection": {
    "connection_id": "21fd90f9-5935-43cd-b6c8-bde9d915ca80",
    "status": "ACTIVE",
    "creation_time": "2025-12-08T07:20:53.488460Z",
    "last_updated_time": "2026-01-31T20:03:32.593153Z",
    "url": "https://connect.maton.ai/?session_token=...",
    "app": "zoho-books",
    "metadata": {}
  }
}

Open the returned

url

in a browser to complete OAuth authorization.

Delete Connection

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections/{connection_id}', method='DELETE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Specifying Connection

If you have multiple Zoho Books connections, specify which one to use with the

Maton-Connection

header:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/zoho-books/books/v3/contacts')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Maton-Connection', '21fd90f9-5935-43cd-b6c8-bde9d915ca80')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

If omitted, the gateway uses the default (oldest) active connection.

API Reference

Available Modules

Zoho Books organizes data into modules. Key modules include:

Module	Endpoint	Description
Contacts	`/contacts`	Customers and vendors
Invoices	`/invoices`	Sales invoices
Bills	`/bills`	Vendor bills
Expenses	`/expenses`	Business expenses
Sales Orders	`/salesorders`	Sales orders
Purchase Orders	`/purchaseorders`	Purchase orders
Credit Notes	`/creditnotes`	Customer credit notes
Recurring Invoices	`/recurringinvoices`	Automated recurring invoices
Recurring Bills	`/recurringbills`	Automated recurring bills

Contacts

List Contacts

GET /zoho-books/books/v3/contacts

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/zoho-books/books/v3/contacts')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "code": 0,
  "message": "success",
  "contacts": [...],
  "page_context": {
    "page": 1,
    "per_page": 200,
    "has_more_page": false,
    "sort_column": "contact_name",
    "sort_order": "A"
  }
}

Get Contact

GET /zoho-books/books/v3/contacts/{contact_id}

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/zoho-books/books/v3/contacts/8527119000000099001')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create Contact

POST /zoho-books/books/v3/contacts
Content-Type: application/json

{
"contact_name": "Customer Name",
"contact_type": "customer"
}

Required Fields:

```
contact_name
```
- Display name for the contact
```
contact_type
```
- Either
```
customer
```
or
```
vendor
```

Optional Fields:

```
company_name
```
- Legal entity name
```
email
```
- Email address
```
phone
```
- Phone number
```
billing_address
```
- Address object
```
payment_terms
```
- Days for payment

Example:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({
    "contact_name": "Acme Corporation",
    "contact_type": "customer",
    "company_name": "Acme Corp",
    "email": "billing@acme.com",
    "phone": "+1-555-1234"
}).encode()
req = urllib.request.Request('https://gateway.maton.ai/zoho-books/books/v3/contacts', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "code": 0,
  "message": "The contact has been added.",
  "contact": {
    "contact_id": "8527119000000099001",
    "contact_name": "Acme Corporation",
    "company_name": "Acme Corp",
    "contact_type": "customer",
    ...
  }
}

Update Contact

PUT /zoho-books/books/v3/contacts/{contact_id}
Content-Type: application/json
{
"contact_name": "Updated Name",
"phone": "+1-555-9999"
}

Example:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({
    "contact_name": "Acme Corporation Updated",
    "phone": "+1-555-9999"
}).encode()
req = urllib.request.Request('https://gateway.maton.ai/zoho-books/books/v3/contacts/8527119000000099001', data=data, method='PUT')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Delete Contact

DELETE /zoho-books/books/v3/contacts/{contact_id}

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/zoho-books/books/v3/contacts/8527119000000099001', method='DELETE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "code": 0,
  "message": "The customer has been deleted."
}

Invoices

List Invoices

GET /zoho-books/books/v3/invoices

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/zoho-books/books/v3/invoices')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get Invoice

GET /zoho-books/books/v3/invoices/{invoice_id}

Create Invoice

POST /zoho-books/books/v3/invoices
Content-Type: application/json
{
"customer_id": "8527119000000099001",
"line_items": [
{
"item_id": "8527119000000100001",
"quantity": 1,
"rate": 100.00
}
]
}

Required Fields:

```
customer_id
```
- Customer identifier
```
line_items
```
- Array of items with
```
item_id
```
or manual entry

Optional Fields:

```
invoice_number
```
- Auto-generated if not specified
```
date
```
- Invoice date (yyyy-mm-dd format)
```
due_date
```
- Payment due date
```
discount
```
- Percentage or fixed amount
```
payment_terms
```
- Days until due

Update Invoice

PUT /zoho-books/books/v3/invoices/{invoice_id}

Delete Invoice

DELETE /zoho-books/books/v3/invoices/{invoice_id}

Invoice Actions

# Mark as sent
POST /zoho-books/books/v3/invoices/{invoice_id}/status/sent
Void invoice
POST /zoho-books/books/v3/invoices/{invoice_id}/status/void
Email invoice
POST /zoho-books/books/v3/invoices/{invoice_id}/email

Bills

List Bills

GET /zoho-books/books/v3/bills

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/zoho-books/books/v3/bills')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create Bill

POST /zoho-books/books/v3/bills
Content-Type: application/json

{
"vendor_id": "8527119000000099002",
"bill_number": "BILL-001",
"date": "2026-02-06",
"line_items": [
{
"account_id": "8527119000000100002",
"description": "Office Supplies",
"amount": 150.00
}
]
}

Required Fields:

```
vendor_id
```
- Vendor identifier
```
bill_number
```
- Unique bill number
```
date
```
- Bill date (yyyy-mm-dd)

Update Bill

PUT /zoho-books/books/v3/bills/{bill_id}

Delete Bill

DELETE /zoho-books/books/v3/bills/{bill_id}

Expenses

List Expenses

GET /zoho-books/books/v3/expenses

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/zoho-books/books/v3/expenses')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create Expense

POST /zoho-books/books/v3/expenses
Content-Type: application/json

{
"account_id": "8527119000000100003",
"date": "2026-02-06",
"amount": 75.50,
"paid_through_account_id": "8527119000000100004",
"description": "Business lunch"
}

Required Fields:

```
account_id
```
- Expense account ID
```
date
```
- Expense date (yyyy-mm-dd)
```
amount
```
- Expense amount
```
paid_through_account_id
```
- Payment account ID

Optional Fields:

```
description
```
- Expense details
```
customer_id
```
- Billable customer ID
```
is_billable
```
- Boolean for billable expenses
```
project_id
```
- Associated project

Update Expense

PUT /zoho-books/books/v3/expenses/{expense_id}

Delete Expense

DELETE /zoho-books/books/v3/expenses/{expense_id}

Sales Orders

List Sales Orders

GET /zoho-books/books/v3/salesorders

Create Sales Order

POST /zoho-books/books/v3/salesorders

Purchase Orders

List Purchase Orders

GET /zoho-books/books/v3/purchaseorders

Create Purchase Order

POST /zoho-books/books/v3/purchaseorders

Credit Notes

List Credit Notes

GET /zoho-books/books/v3/creditnotes

Recurring Invoices

List Recurring Invoices

GET /zoho-books/books/v3/recurringinvoices

Recurring Bills

List Recurring Bills

GET /zoho-books/books/v3/recurringbills

Pagination

Zoho Books uses page-based pagination:

GET /zoho-books/books/v3/contacts?page=1&per_page=50

Response includes pagination info in

page_context

{
  "code": 0,
  "message": "success",
  "contacts": [...],
  "page_context": {
    "page": 1,
    "per_page": 50,
    "has_more_page": true,
    "sort_column": "contact_name",
    "sort_order": "A"
  }
}

Continue fetching while

has_more_page

true

, incrementing

page

each time.

Code Examples

JavaScript

const response = await fetch(
  'https://gateway.maton.ai/zoho-books/books/v3/contacts',
  {
    headers: {
      'Authorization': `Bearer ${process.env.MATON_API_KEY}`
    }
  }
);
const data = await response.json();

Python

import os
import requests
response = requests.get(
'https://gateway.maton.ai/zoho-books/books/v3/contacts&#x27;,
headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'}
)
data = response.json()

Notes

All successful responses have
```
code: 0
```
and a
```
message
```
field
Dates should be in
```
yyyy-mm-dd
```
format
Contact types are
```
customer
```
or
```
vendor
```
Some modules (items, chart of accounts, bank accounts, projects) may require additional OAuth scopes. If you receive a scope error, contact Maton support at support@maton.ai with the specific operations/APIs you need and your use-case
Rate limits: 100 requests/minute per organization
Daily limits vary by plan: Free (1,000), Standard (2,000), Professional (5,000), Paid (10,000)
IMPORTANT: When using curl commands, use
```
curl -g
```
when URLs contain brackets to disable glob parsing
IMPORTANT: When piping curl output to
```
jq
```
or other commands, environment variables like
```
$MATON_API_KEY
```
may not expand correctly in some shell environments

Error Handling

Status	Meaning
400	Missing Zoho Books connection or invalid request
401	Invalid or missing Maton API key, or OAuth scope mismatch
404	Resource not found
429	Rate limited
4xx/5xx	Passthrough error from Zoho Books API

Common Error Codes

Code	Description
0	Success
57	Not authorized (OAuth scope mismatch)
1	Invalid value
2	Mandatory field missing
3	Resource does not exist
5	Invalid URL

Troubleshooting: API Key Issues

Check that the
```
MATON_API_KEY
```
environment variable is set:

echo $MATON_API_KEY

Verify the API key is valid by listing connections:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Troubleshooting: Invalid App Name

Ensure your URL path starts with
```
zoho-books
```
. For example:

Correct:

https://gateway.maton.ai/zoho-books/books/v3/contacts

Incorrect:

https://gateway.maton.ai/books/v3/contacts

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Zoho Books

Quick Start

Base URL

Authentication

Getting Your API Key

Connection Management

List Connections

Create Connection

Get Connection

Delete Connection

Specifying Connection

API Reference

Available Modules

Contacts

List Contacts

Get Contact

Create Contact

Update Contact

Delete Contact

Invoices

List Invoices

Get Invoice

Create Invoice

Update Invoice

Delete Invoice

Invoice Actions

Void invoice

Email invoice

Bills

List Bills

Create Bill

Update Bill

Delete Bill

Expenses

List Expenses

Create Expense

Update Expense

Delete Expense

Sales Orders

List Sales Orders

Create Sales Order

Purchase Orders

List Purchase Orders

Create Purchase Order

Credit Notes

List Credit Notes

Recurring Invoices

List Recurring Invoices

Recurring Bills

List Recurring Bills

Pagination

Code Examples

JavaScript

Python

Notes

Error Handling

Common Error Codes

Troubleshooting: API Key Issues

Troubleshooting: Invalid App Name

Resources

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README

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