How to integrate PayPal Zettle MCP with Atomic Agent

Connect Atomic Agent to PayPal Zettle MCP. List products in your paypal zettle library, check low-stock paypal zettle inventory items, and more using natural language, with authentication handled for you.

PayPal Zettle logoPayPal Zettle
Oauth2S2s Oauth2

PayPal Zettle is a point-of-sale platform with APIs for products, inventory, purchases, and finance. It helps merchants manage store operations and sales data in one place.

55 Tools

Introduction

Atomic Agent is an open-source AI agent that runs on your machine and supports local models through llama.cpp. Connect it to 1,500+ apps through Composio, including PayPal Zettle.

This guide uses Atomic Agent's built-in Composio integration. You need Atomic Agent v0.5.6 or later, your own Composio API key, and a PayPal Zettle account. See the Atomic Agent documentation for installation instructions.

Also integrate PayPal Zettle with

How Atomic Agent connects to PayPal Zettle

Atomic Agent connects to Composio's Tool Router over Streamable HTTP MCP. It discovers the tools needed for your request, and Composio handles account authentication.

Execution and account-connection tools follow Atomic Agent's configured approval policy. Review any approval prompt before allowing an action on your connected account.

Connect PayPal Zettle to Atomic Agent

  1. Sign up or sign in to the Composio dashboard. Copy your API key.
  2. In Atomic Agent, open the Integrations tab and select Composio. Select API key, press e, paste the key, and press Enter. The tools become available immediately, without a restart.
  3. Ask Atomic Agent to do something in PayPal Zettle. It searches Composio for the right tool.
  4. On first use, open the sign-in link returned in the chat. Connect your PayPal Zettle account, then return to Atomic Agent to continue.

Headless setup

Add the following line to ~/.atomic-agent/.env, replacing YOUR_COMPOSIO_API_KEY with your key. Start Atomic Agent after saving the file.

bash
COMPOSIO_API_KEY=YOUR_COMPOSIO_API_KEY

What is the PayPal Zettle MCP server, and what's possible with it?

The PayPal Zettle MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your PayPal Zettle account. It provides structured and secure access to your product library, inventory, purchases, finance data, tax settings, and webhook subscriptions, so your agent can manage products and categories, track stock, review purchases and transactions, and configure discounts and tax rates on your behalf.

  • Product library management: Have your agent create, update, list, count, import, and delete products, categories, product images, discounts, and tax rates in your Zettle library.
  • Inventory and stock tracking: Let the agent list inventories, check product stock, review low-stock settings, and monitor inventory tracking across your stores.
  • Purchase and finance reporting: Direct your agent to retrieve purchases and refunds, list transactions within a date range, check account balances, and review payout information.
  • Tax and discount administration: Instruct your agent to retrieve tax settings, manage tax rates, create or remove discounts, and check how many products use each tax rate.
  • Webhook subscription management: Have your agent create and delete Zettle webhook subscriptions for selected events and retrieve the signing key needed to verify incoming messages.

Use PayPal Zettle from Atomic Agent

With your account connected, ask Atomic Agent to work with PayPal Zettle in natural language. You can connect more apps through the same Composio integration as you need them.

Visit the Atomic Agent website or inspect the Atomic Agent source code.

Troubleshooting

Why is my API key rejected?

Copy the key directly from the Composio dashboard. Atomic Agent requires ASCII characters because it sends the key in an HTTP header. Remove any extra characters introduced when copying.

Why are Composio tools unavailable after saving a key?

Check that you use Atomic Agent v0.5.6 or later and that Composio is enabled in your configuration. A "composio": { "enabled": false } setting disables the integration while keeping the saved key on disk.

Does Composio have a free plan?

The Hobby plan includes 100,000 tool calls per month. Composio-managed OAuth apps have a lower included allowance. See Composio pricing for the current limits that apply to your connection.

TOOLS

Supported Tools

Every PayPal Zettle action and event your agent gets out of the box.

Count Products

Retrieve the count of existing products for a merchant organization.

Count Products By Tax Rate

Get each tax rate and its associated product count.

Create Categories

Create one or more product categories in one request and return creation metadata.

Create Discount

Create a fixed-amount or percentage discount in a product library.

Create Inventory

Create one Zettle STORE inventory from its name and optional description.

Create Product

Create a product and up to 99 complete embedded variants.

Create Tax Rates

Create up to 15 tax rates in one request.

Create Webhook Subscription

Create a Zettle webhook subscription for selected events at a public HTTPS destination and return the signing key needed to verify incoming messages.

Delete Category

Permanently delete a category.

Delete Discount

Permanently delete one discount.

Delete Products

Permanently delete one or more products and their embedded variants.

Delete Tax Rate

Permanently delete one tax rate.

Delete Webhook Subscription

Permanently delete a Zettle webhook subscription.

Fetch Product Image

Fetch a product image by lookup key, optionally resizing, cropping, or converting it, and return a downloadable file.

Generate Product Slug

Create a unique online product slug from a product name.

Get Discount

Retrieve one discount from a merchant's product library.

Get Finance Balance

Get the balance of the merchant's preliminary or liquid Zettle account, optionally at a specified point in time.

Get Import Status

Return the latest product-library import status, or a specific import when import_uuid is provided.

Get Inventory

Fetch one inventory belonging to the connected Zettle organization.

Get Payout Info

Get the connected merchant's liquid-account payout balance, next payout amount, voucher discount balance, and payout schedule at a point in time.

Get Product

Retrieve one product and its complete embedded variants.

Get Product Library

Return one page of the complete product library or changes after an event-log UUID, including full products, embedded variants, and discounts.

Get Product Stock

Return one page of variant stock balances from the documented product- and inventory-specific Zettle endpoint, including low-stock settings and a continuation cursor.

Get Purchase

Fetch one immutable Zettle purchase or refund by its UUID version 1, including complete item, payment, discount, tax, and refund details.

Get Selected Products Stock

Return one page of product-variant stock balances for selected products in one Zettle inventory.

Get Tax Rate

Get one tax rate.

Get Tax Settings

Get organization tax settings and the organization UUID needed by other Zettle actions.

Get Tracking Status

Return inventory-tracking status for selected Zettle products.

Import Library Items

Start an asynchronous product import.

Import Product Images

Import one or more product images from HTTPS URLs and return their lookup keys.

List Categories

Retrieve all product categories for a merchant organization.

List Discounts

Retrieve all discounts from a merchant's product library.

List Finance Transactions

Return one page of transactions from a Zettle preliminary or liquid account within a required date range, optionally filtered by transaction type.

List Inventories

List the merchant organization's inventories and the UUIDs needed for stock-management actions.

List Inventory Stock

Return one page of product-variant stock balances from the documented inventory-specific Zettle endpoint, including low-stock settings and a continuation cursor.

List Library Images

Retrieve all image references used by library items.

List Product Options

Retrieve aggregate active variant options in the product library.

List Products

List all POS-visible products with complete embedded variants in the selected current or legacy representation.

List Purchases

Return one page of purchases and refunds from up to three years ago, with date and ordering filters plus an opaque continuation cursor.

List Stock

Return one page of variant stock balances across Zettle store inventories, optionally filtered by inventory or product.

List Stock Updates

Return one page of stock-balance updates made at or after a timestamp, optionally filtered to specific inventories, with a continuation cursor.

List Tax Rates

List the connected merchant's tax rates.

List Tracked Products

Return one page of UUIDs for Zettle products with inventory tracking enabled, with an opaque continuation cursor when more records are available.

List Tracking Updates

Return one page of product inventory-tracking status changes made at or after a timestamp, with a continuation cursor when more are available.

List Webhook Subscriptions

List all webhook subscriptions configured for a Zettle organization.

Move Inventory Stock

Atomically move product-variant quantities between inventories.

Set Inventory Tracking

Start or stop inventory tracking for one or more Zettle products.

Set Low Stock Levels

Set low-stock refill thresholds and Zettle Go alert settings for product variants across inventories.

Update Category

Rename a category.

Update Discount

Update selected fields of a discount using JSON merge-patch semantics, optionally guarded by its ETag.

Update Product

Replace a product using Zettle's full update contract.

Update Tax Rate

Update one tax rate.

Update Tax Settings

Update the organization's taxation mode.

Update Webhook Subscription

Change a Zettle webhook subscription's selected events, HTTPS destination, transport, or contact email.

Upload Product Image

Upload one GIF, JPEG, or PNG product image smaller than 5 MB and larger than 50 by 50 pixels.

FAQ

Frequently asked questions

With a standalone PayPal Zettle MCP server, the agents and LLMs can only access a fixed set of PayPal Zettle tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from PayPal Zettle and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Atomic Agent fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right PayPal Zettle tools.

Yes, absolutely. You can configure which PayPal Zettle scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your PayPal Zettle data and credentials are handled as safely as possible.

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