Squareup

Square

Access the Square API with managed OAuth authentication. Process payments, manage customers, orders, catalog items, inventory, and invoices.

Quick Start

# List locations
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/squareup/v2/locations')
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/squareup/{native-api-path}

Replace {native-api-path} with the actual Square API endpoint path. The gateway proxies requests to connect.squareup.com 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

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

Connection Management

Manage your Square 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=squareup&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': 'squareup'}).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": "squareup",
    "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 Square 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/squareup/v2/locations')
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

Locations

List Locations

GET /squareup/v2/locations

Get Location

GET /squareup/v2/locations/{location_id}

Create Location

POST /squareup/v2/locations
Content-Type: application/json

{
  "location": {
    "name": "New Location",
    "address": {
      "address_line_1": "123 Main St",
      "locality": "San Francisco",
      "administrative_district_level_1": "CA",
      "postal_code": "94102",
      "country": "US"
    }
  }
}

Update Location

PUT /squareup/v2/locations/{location_id}
Content-Type: application/json

{
  "location": {
    "name": "Updated Location Name"
  }
}

Merchants

Get Merchant

GET /squareup/v2/merchants/me

List Merchants

GET /squareup/v2/merchants

Payments

List Payments

GET /squareup/v2/payments

With filters:

GET /squareup/v2/payments?location_id={location_id}&begin_time=2026-01-01T00:00:00Z&end_time=2026-02-01T00:00:00Z

Get Payment

GET /squareup/v2/payments/{payment_id}

Create Payment

POST /squareup/v2/payments
Content-Type: application/json

{
  "source_id": "cnon:card-nonce-ok",
  "idempotency_key": "unique-key-12345",
  "amount_money": {
    "amount": 1000,
    "currency": "USD"
  },
  "location_id": "{location_id}"
}

Update Payment

PUT /squareup/v2/payments/{payment_id}
Content-Type: application/json

{
  "payment": {
    "tip_money": {
      "amount": 200,
      "currency": "USD"
    }
  },
  "idempotency_key": "unique-key-67890"
}

Complete Payment

POST /squareup/v2/payments/{payment_id}/complete
Content-Type: application/json

{}

Cancel Payment

POST /squareup/v2/payments/{payment_id}/cancel
Content-Type: application/json

{}

Refunds

List Refunds

GET /squareup/v2/refunds

Get Refund

GET /squareup/v2/refunds/{refund_id}

Create Refund

POST /squareup/v2/refunds
Content-Type: application/json

{
  "idempotency_key": "unique-refund-key",
  "payment_id": "{payment_id}",
  "amount_money": {
    "amount": 500,
    "currency": "USD"
  },
  "reason": "Customer requested refund"
}

Customers

List Customers

GET /squareup/v2/customers

Get Customer

GET /squareup/v2/customers/{customer_id}

Create Customer

POST /squareup/v2/customers
Content-Type: application/json

{
  "given_name": "John",
  "family_name": "Doe",
  "email_address": "john.doe@example.com",
  "phone_number": "+15551234567"
}

Update Customer

PUT /squareup/v2/customers/{customer_id}
Content-Type: application/json

{
  "email_address": "john.updated@example.com"
}

Delete Customer

DELETE /squareup/v2/customers/{customer_id}

Search Customers

POST /squareup/v2/customers/search
Content-Type: application/json

{
  "query": {
    "filter": {
      "email_address": {
        "exact": "john.doe@example.com"
      }
    }
  }
}

Orders

Create Order

POST /squareup/v2/orders
Content-Type: application/json

{
  "order": {
    "location_id": "{location_id}",
    "line_items": [
      {
        "name": "Item 1",
        "quantity": "1",
        "base_price_money": {
          "amount": 1000,
          "currency": "USD"
        }
      }
    ]
  },
  "idempotency_key": "unique-order-key"
}

Get Order

GET /squareup/v2/orders/{order_id}

Update Order

PUT /squareup/v2/orders/{order_id}
Content-Type: application/json

{
  "order": {
    "location_id": "{location_id}",
    "version": 1
  },
  "fields_to_clear": ["line_items"]
}

Search Orders

POST /squareup/v2/orders/search
Content-Type: application/json

{
  "location_ids": ["{location_id}"],
  "query": {
    "filter": {
      "state_filter": {
        "states": ["OPEN"]
      }
    }
  }
}

Batch Retrieve Orders

POST /squareup/v2/orders/batch-retrieve
Content-Type: application/json

{
  "location_id": "{location_id}",
  "order_ids": ["{order_id_1}", "{order_id_2}"]
}

Catalog

List Catalog

GET /squareup/v2/catalog/list

With type filter:

GET /squareup/v2/catalog/list?types=ITEM,CATEGORY

Get Catalog Object

GET /squareup/v2/catalog/object/{object_id}

Upsert Catalog Object

POST /squareup/v2/catalog/object
Content-Type: application/json

{
  "idempotency_key": "unique-catalog-key",
  "object": {
    "type": "ITEM",
    "id": "#new-item",
    "item_data": {
      "name": "Coffee",
      "description": "Hot brewed coffee",
      "variations": [
        {
          "type": "ITEM_VARIATION",
          "id": "#small-coffee",
          "item_variation_data": {
            "name": "Small",
            "pricing_type": "FIXED_PRICING",
            "price_money": {
              "amount": 300,
              "currency": "USD"
            }
          }
        }
      ]
    }
  }
}

Delete Catalog Object

DELETE /squareup/v2/catalog/object/{object_id}

Batch Upsert Catalog Objects

POST /squareup/v2/catalog/batch-upsert
Content-Type: application/json

{
  "idempotency_key": "unique-batch-key",
  "batches": [
    {
      "objects": [...]
    }
  ]
}

Search Catalog Objects

POST /squareup/v2/catalog/search
Content-Type: application/json

{
  "object_types": ["ITEM"],
  "query": {
    "text_query": {
      "keywords": ["coffee"]
    }
  }
}

Get Catalog Info

GET /squareup/v2/catalog/info

Inventory

Retrieve Inventory Count

GET /squareup/v2/inventory/{catalog_object_id}

Batch Retrieve Inventory Counts

POST /squareup/v2/inventory/counts/batch-retrieve
Content-Type: application/json

{
  "catalog_object_ids": ["{object_id_1}", "{object_id_2}"],
  "location_ids": ["{location_id}"]
}

Batch Change Inventory

POST /squareup/v2/inventory/changes/batch-create
Content-Type: application/json

{
  "idempotency_key": "unique-inventory-key",
  "changes": [
    {
      "type": "ADJUSTMENT",
      "adjustment": {
        "catalog_object_id": "{object_id}",
        "location_id": "{location_id}",
        "quantity": "10",
        "from_state": "NONE",
        "to_state": "IN_STOCK"
      }
    }
  ]
}

Retrieve Inventory Adjustment

GET /squareup/v2/inventory/adjustments/{adjustment_id}

Invoices

List Invoices

GET /squareup/v2/invoices?location_id={location_id}

Get Invoice

GET /squareup/v2/invoices/{invoice_id}

Create Invoice

POST /squareup/v2/invoices
Content-Type: application/json

{
  "invoice": {
    "location_id": "{location_id}",
    "order_id": "{order_id}",
    "primary_recipient": {
      "customer_id": "{customer_id}"
    },
    "payment_requests": [
      {
        "request_type": "BALANCE",
        "due_date": "2026-02-15"
      }
    ],
    "delivery_method": "EMAIL"
  },
  "idempotency_key": "unique-invoice-key"
}

Update Invoice

PUT /squareup/v2/invoices/{invoice_id}
Content-Type: application/json

{
  "invoice": {
    "version": 1,
    "payment_requests": [
      {
        "uid": "{payment_request_uid}",
        "due_date": "2026-02-20"
      }
    ]
  },
  "idempotency_key": "unique-update-key"
}

Publish Invoice

POST /squareup/v2/invoices/{invoice_id}/publish
Content-Type: application/json

{
  "version": 1,
  "idempotency_key": "unique-publish-key"
}

Cancel Invoice

POST /squareup/v2/invoices/{invoice_id}/cancel
Content-Type: application/json

{
  "version": 1
}

Delete Invoice

DELETE /squareup/v2/invoices/{invoice_id}?version=1

Search Invoices

POST /squareup/v2/invoices/search
Content-Type: application/json

{
  "query": {
    "filter": {
      "location_ids": ["{location_id}"],
      "customer_ids": ["{customer_id}"]
    }
  }
}

Pagination

Square uses cursor-based pagination. List endpoints return a cursor field when more results exist:

GET /squareup/v2/payments?cursor={cursor_value}

Response includes pagination info:

{
  "payments": [...],
  "cursor": "next_page_cursor_value"
}

Continue fetching by passing the cursor value in subsequent requests until no cursor is returned.

Code Examples

JavaScript

const response = await fetch(
  'https://gateway.maton.ai/squareup/v2/locations',
  {
    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/squareup/v2/locations',
    headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'}
)
data = response.json()

Notes

• All amounts are in the smallest currency unit (e.g., cents for USD: 1000 = $10.00)
• IDs are alphanumeric strings
• Timestamps are in ISO 8601 format (e.g., 2026-02-07T01:59:28.459Z)
• Most write operations require an idempotency_key to prevent duplicate operations
• Some endpoints require specific OAuth scopes (CUSTOMERS_READ, ORDERS_READ, ITEMS_READ, INVOICES_READ, etc.)
• 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

Error Response Format

{
  "errors": [
    {
      "category": "INVALID_REQUEST_ERROR",
      "code": "NOT_FOUND",
      "detail": "Could not find payment with id: {payment_id}"
    }
  ]
}

Troubleshooting: Invalid API Key

When you receive a "Invalid API key" error, ALWAYS follow these steps before concluding there is an issue:

1. Check that the MATON_API_KEY environment variable is set:

echo $MATON_API_KEY

2. 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: Insufficient Scopes

If you receive a 403 error with INSUFFICIENT_SCOPES, the OAuth connection doesn't have the required permissions. Create a new connection and ensure you grant all necessary permissions during OAuth authorization.

Resources

• Square API Overview
• Square API Reference
• Payments API
• Customers API
• Orders API
• Catalog API
• Inventory API
• Invoices API
• Locations API