Square

Square API integration with managed OAuth. Process payments, manage customers, orders, catalog, inventory, invoices, loyalty programs, team members, and more...

Security Scan

The skill's requirements and runtime instructions align with its stated purpose (Square integration via a Maton-managed gateway) and it is an instruction-only skill that only asks for a single gateway API key.

Purpose & Capability

Name/description advertise Square API access; SKILL.md routes all calls through a Maton gateway (gateway.maton.ai / ctrl.maton.ai) and requires a MATON_API_KEY — this is coherent for a managed-OAuth Square integration.

Instruction Scope

Instructions are narrowly scoped: they show how to call the Maton gateway endpoints, manage OAuth connections via ctrl.maton.ai, and set the MATON_API_KEY. They do not instruct the agent to read unrelated files, other env vars, or send data to unexpected endpoints.

Install Mechanism

No install spec and no code files beyond SKILL.md and a license — instruction-only (lowest install risk). Nothing will be downloaded or written to disk by an installer.

Credentials

Only a single environment variable (MATON_API_KEY) is required, which matches the gateway-based authentication described. No unrelated credentials or config paths are requested.

Persistence & Privilege

always is false, model invocation is allowed (platform default). The skill does not request permanent system presence or attempt to modify other skills or system-wide settings.

Assessment

This skill proxies Square API calls through Maton (gateway.maton.ai / ctrl.maton.ai) and requires your MATON_API_KEY. Before installing: verify you trust Maton (the registry entry has no homepage listed), avoid putting high-privilege keys into shared agents, and use least-privilege/sandbox keys for testing. If you prefer not to route Square data through a third party, consider a direct Square integration instead. Do not paste your API key into public chat or logs.

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": "[e-mail]",
  "phone_number": "[phone]"
}

Update Customer

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

{
  "email_address": "[e-mail]"
}

Delete Customer

DELETE /squareup/v2/customers/{customer_id}

Search Customers

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

{
  "query": {
    "filter": {
      "email_address": {
        "exact": "[e-mail]"
      }
    }
  }
}

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}"]
}

Pay Order

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

{
  "idempotency_key": "unique-key",
  "payment_ids": ["{payment_id}"]
}

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}"]
    }
  }
}

Team Members

Search Team Members

POST /squareup/v2/team-members/search
Content-Type: application/json

{
  "query": {
    "filter": {
      "location_ids": ["{location_id}"],
      "status": "ACTIVE"
    }
  }
}

Get Team Member

GET /squareup/v2/team-members/{team_member_id}

Update Team Member

PUT /squareup/v2/team-members/{team_member_id}
Content-Type: application/json

{
  "team_member": {
    "given_name": "Updated Name"
  }
}

Loyalty

List Loyalty Programs

GET /squareup/v2/loyalty/programs

Get Loyalty Program

GET /squareup/v2/loyalty/programs/{program_id}

Search Loyalty Accounts

POST /squareup/v2/loyalty/accounts/search
Content-Type: application/json

{
  "query": {
    "customer_ids": ["{customer_id}"]
  }
}

Create Loyalty Account

POST /squareup/v2/loyalty/accounts
Content-Type: application/json

{
  "loyalty_account": {
    "program_id": "{program_id}",
    "mapping": {
      "phone_number": "[phone]"
    }
  },
  "idempotency_key": "unique-key"
}

Accumulate Loyalty Points

POST /squareup/v2/loyalty/accounts/{account_id}/accumulate
Content-Type: application/json

{
  "accumulate_points": {
    "order_id": "{order_id}"
  },
  "location_id": "{location_id}",
  "idempotency_key": "unique-key"
}

Payment Links (Online Checkout)

List Payment Links

GET /squareup/v2/online-checkout/payment-links

Get Payment Link

GET /squareup/v2/online-checkout/payment-links/{id}

Create Payment Link

POST /squareup/v2/online-checkout/payment-links
Content-Type: application/json

{
  "idempotency_key": "unique-key",
  "quick_pay": {
    "name": "Payment for Service",
    "price_money": {
      "amount": 1000,
      "currency": "USD"
    },
    "location_id": "{location_id}"
  }
}

Update Payment Link

PUT /squareup/v2/online-checkout/payment-links/{id}
Content-Type: application/json

{
  "payment_link": {
    "version": 1,
    "description": "Updated description"
  }
}

Delete Payment Link

DELETE /squareup/v2/online-checkout/payment-links/{id}

Cards

List Cards

GET /squareup/v2/cards
GET /squareup/v2/cards?customer_id={customer_id}

Get Card

GET /squareup/v2/cards/{card_id}

Create Card

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

{
  "idempotency_key": "unique-key",
  "source_id": "cnon:card-nonce-ok",
  "card": {
    "customer_id": "{customer_id}"
  }
}

Disable Card

POST /squareup/v2/cards/{card_id}/disable

Payouts

List Payouts

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

Get Payout

GET /squareup/v2/payouts/{payout_id}

List Payout Entries

GET /squareup/v2/payouts/{payout_id}/payout-entries

Bank Accounts

List Bank Accounts

GET /squareup/v2/bank-accounts

Get Bank Account

GET /squareup/v2/bank-accounts/{bank_account_id}

Terminal

List Terminal Checkouts

GET /squareup/v2/terminals/checkouts

Create Terminal Checkout

POST /squareup/v2/terminals/checkouts
Content-Type: application/json

{
  "idempotency_key": "unique-key",
  "checkout": {
    "amount_money": {
      "amount": 1000,
      "currency": "USD"
    },
    "device_options": {
      "device_id": "{device_id}"
    }
  }
}

Get Terminal Checkout

GET /squareup/v2/terminals/checkouts/{checkout_id}

Search Terminal Checkouts

POST /squareup/v2/terminals/checkouts/search
Content-Type: application/json

{
  "query": {
    "filter": {
      "status": "COMPLETED"
    }
  }
}

Cancel Terminal Checkout

POST /squareup/v2/terminals/checkouts/{checkout_id}/cancel

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

Status	Meaning
400	Missing Square connection or bad request
401	Invalid or missing Maton API key
403	Insufficient OAuth scopes
404	Resource not found
429	Rate limited
4xx/5xx	Passthrough error from Square API

Error Response Format

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

Troubleshooting: API Key Issues

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: Invalid App Name

1. Ensure your URL path starts with squareup. For example:

• Correct: https://gateway.maton.ai/squareup/v2/locations
• Incorrect: https://gateway.maton.ai/v2/locations

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
• Team Members API
• Loyalty API
• Online Checkout API
• Cards API
• Payouts API
• Bank Accounts API
• Terminal API
• Maton Community
• Maton Support