Connect Loop Subscriptions to Claude: Handle Loyalty & Plan Changes

If your team uses ChatGPT, check out our guide on /connect-loop-subscriptions-to-chatgpt-manage-orders-schedules/ or explore our broader architectural overview on /connect-loop-subscriptions-to-ai-agents-automate-billing-reporting/.

Giving an AI agent read and write access to a complex subscription management platform requires a strictly typed translation layer. You need a Model Context Protocol (MCP) server to act as the bridge between Claude's function calling capabilities and Loop Subscriptions' REST APIs. You can either build and maintain this infrastructure yourself, dealing with constant API schema changes and authentication lifecycle management, or use a managed integration platform like Truto to dynamically generate a secure, authenticated MCP server URL.

This guide breaks down exactly how to use Truto to generate a secure, managed MCP server for Loop Subscriptions, connect it natively to Claude Desktop, and execute complex e-commerce workflows - like processing line-item swaps, applying retention offers, and adjusting billing schedules - using natural language.

The Engineering Reality of the Loop Subscriptions API

A custom MCP server is a self-hosted integration layer. While the open MCP standard provides a predictable way for models to discover tools, the reality of implementing it against specialized e-commerce APIs is painful. Loop Subscriptions is built to manage complex subscriber lifecycles, and its API enforces strict domain logic that an LLM must navigate perfectly.

If you build a custom Loop Subscriptions MCP server, here are the specific integration challenges you will face:

Strict State Machine Enforcements Loop Subscriptions manages contracts through a rigid state machine. You cannot simply use a generic PATCH request to change a subscription's status to "paused" or "cancelled". You must invoke specific lifecycle endpoints (/pause, /resume, /cancel, /reactivate). An LLM has no inherent knowledge of this state machine. Your MCP server must expose discrete, strictly typed tools that map directly to these lifecycle actions so Claude understands exactly how to alter a subscription's state.

Bifurcated Line Item Mutations Altering a subscriber's order isn't straightforward. Loop differentiates between recurring line item swaps and one-time additions. If a customer wants to try a new flavor for just one month, you cannot use standard update endpoints without permanently altering their recurring contract. You must expose specific tools for subscription_lines_create_once versus subscription_lines_swap. If you fail to separate these concerns at the tool level, the LLM will hallucinate payloads that permanently break recurring billing expectations.

Epoch Time Constraints and Billing Rules Loop Subscriptions requires precise epoch timestamps for billing modifications. Furthermore, business rules are strictly enforced at the API level - for example, a new billing date must be at least 24 hours in the future. If a customer asks Claude to "move my shipment to tomorrow", a naive tool implementation will fail. You must provide explicitly documented tool schemas that instruct the LLM on acceptable time bounds and required integer epoch formats.

Rate Limiting and Retry Responsibility Like any high-volume e-commerce API, Loop Subscriptions enforces rate limits. It is critical to note that Truto does not retry, throttle, or apply backoff logic to rate limit errors. When the upstream API returns an HTTP 429, Truto passes that error directly to the caller. Truto normalizes the upstream rate limit information into standardized headers (ratelimit-limit, ratelimit-remaining, ratelimit-reset) per the IETF specification. Your AI agent or client architecture is entirely responsible for detecting these 429s, reading the reset headers, and applying exponential backoff.

How to Generate a Loop Subscriptions MCP Server

Truto derives MCP tools dynamically from the integration's documented resources and schemas. Rather than hand-coding tool definitions, Truto translates the Loop Subscriptions REST API into JSON-RPC 2.0 tools. A tool only appears if it has a corresponding documentation entry, acting as a curation layer to ensure the LLM only sees high-quality, well-defined endpoints.

Each server is scoped to a single authenticated tenant and secured by a cryptographic token. You can generate this server via the UI or programmatically via the API.

Method 1: Via the Truto UI

For ad-hoc agents or internal administrative workflows, the quickest path is generating the server through the dashboard.

1. Navigate to the Integrated Accounts page in your Truto dashboard.
2. Select your connected Loop Subscriptions account.
3. Click the MCP Servers tab.
4. Click Create MCP Server.
5. Select your desired configuration (e.g., restrict to write methods, or tag filters like billing).
6. Copy the generated MCP server URL (e.g., https://api.truto.one/mcp/a1b2c3d4...).

Method 2: Via the Truto API

For production multi-tenant environments where you are provisioning agents on behalf of your customers, you should generate MCP servers programmatically.

Make an authenticated POST request to /integrated-account/:id/mcp. The API verifies plan limits, checks that tools are available, and stores the hashed token in distributed edge storage for low-latency routing.

curl -X POST https://api.truto.one/integrated-account/{integrated_account_id}/mcp \
  -H "Authorization: Bearer YOUR_TRUTO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Loop Support Agent Server",
    "config": {
      "methods": ["read", "write", "custom"]
    },
    "expires_at": "2026-12-31T23:59:59Z"
  }'

The response will contain the secure URL you need to configure Claude:

{
  "id": "mcp_8a9b0c1d2e",
  "name": "Loop Support Agent Server",
  "url": "https://api.truto.one/mcp/a1b2c3d4e5f6...",
  "expires_at": "2026-12-31T23:59:59Z"
}

How to Connect the MCP Server to Claude

Once you have your Truto MCP URL, you can plug it directly into your AI environment. Because Truto's MCP servers are self-contained, the URL includes the routing and authentication token.

Method A: Via the Claude Desktop UI

If you are using Claude Desktop or ChatGPT for internal operations, you can connect the server natively through the application settings.

For Claude Desktop:

1. Open Settings -> Integrations -> Add MCP Server.
2. Paste your Truto MCP URL into the connection string field.
3. Click Add. Claude will immediately initialize the connection and request the available tools.

For ChatGPT:

1. Open Settings -> Apps -> Advanced settings.
2. Enable Developer mode.
3. Under MCP servers, add a new server, give it a name like "Loop Subscriptions", and paste the Truto MCP URL.
4. Save and exit.

Method B: Via Manual Configuration File (SSE Transport)

If you are configuring an agent framework programmatically (like LangChain, LangGraph, or custom Claude SDK implementations), you can use the official SSE transport package. Since Truto exposes MCP over HTTP using Server-Sent Events, you use the @modelcontextprotocol/server-sse wrapper.

Update your claude_desktop_config.json (or equivalent agent config) to route requests through the SSE proxy:

{
  "mcpServers": {
    "loop-subscriptions": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-sse",
        "https://api.truto.one/mcp/a1b2c3d4e5f6..."
      ]
    }
  }
}

When Claude initializes, it will send an initialize JSON-RPC request to this endpoint. Truto validates the token, dynamically generates the tools from the integration documentation, and returns the tool schemas to the model.

Hero Tools for Loop Subscriptions

Truto automatically generates descriptively named, snake_case tools from Loop Subscriptions' underlying API resources. We inject metadata into these schemas - such as explicit instructions for pagination cursors - to ensure the LLM interacts predictably with the API.

Here are 7 high-leverage tools available for Loop Subscriptions.

get_single_loop_subscriptions_subscription_by_id

Fetches the complete state of a subscription contract, including its current status, billing policy, delivery policy, and nested line items. This is the foundational tool Claude uses to build context before attempting any mutations.

"Look up the subscription details for contract loop-sub-9876. I need to know the current status and what items are currently in their box."

loop_subscriptions_subscriptions_reschedule

Modifies the next billing date for an upcoming order. The LLM must pass the new billing date as an epoch timestamp that is at least 24 hours in the future.

"The customer for subscription loop-sub-9876 is going on vacation. Reschedule their next billing date to exactly two weeks from today."

loop_subscriptions_subscription_lines_swap

Swaps an existing line item in a recurring contract with a new product variant. This handles the complex pricing and delivery updates required when a customer wants to permanently change their subscription flavor or size.

"For subscription loop-sub-9876, swap the line item containing the 12oz Vanilla Roast with the 16oz Dark Roast variant (shopify-var-555)."

loop_subscriptions_subscriptions_pause

Halts active billing and deliveries. This invokes the specific state-machine transition required by Loop, ensuring no further charges occur until a resume command is issued.

"Pause subscription loop-sub-9876 immediately. The customer requested a temporary hold on all shipments."

loop_subscriptions_subscriptions_change_plan

Updates the subscription frequency (e.g., changing from a 30-day delivery schedule to a 60-day schedule). This requires the specific Shopify selling plan ID that corresponds to the new frequency.

"Upgrade subscription loop-sub-9876 to the weekly delivery plan using selling plan ID shopify-plan-222."

loop_subscriptions_subscription_upgrades_apply_profile

Applies a predefined upgrade or retention profile to a subscription contract. This is critical for automated churn prevention workflows, allowing the LLM to apply a configured retention offer (like a discount or free gift) based on customer sentiment.

"The customer for loop-sub-9876 is complaining about the price. Apply the '15% Off 3 Months' retention profile to their contract to save the account."

loop_subscriptions_customer_loyalty_points_credit_points

Credits loyalty points directly to a Loopwork customer profile. Useful for appeasement workflows, apologies for shipping delays, or reward milestones.

"Customer loop-cust-444 experienced a delayed shipment last week. Credit 500 loyalty points to their account as an apology."

For the complete inventory of available tools, query parameters, and schema definitions, visit the Loop Subscriptions integration page.

Workflows in Action

When you give Claude access to these tools, it can orchestrate complex, multi-step customer support and retention workflows autonomously. Here is how an AI agent executes real-world scenarios.

Scenario 1: The Flavor Swap and Delivery Reschedule

A common support request requires modifying both the contents of the subscription and its timing.

"Can you push my next subscription order (loop-sub-101) out by a week? Also, I am tired of the strawberry flavor, can you swap it out for chocolate (variant shopify-var-777) permanently?"

Execution Steps:

1. get_single_loop_subscriptions_subscription_by_id: Claude calls this to verify the subscription is active, identify the current next billing epoch, and locate the internal line_id for the strawberry flavor.
2. loop_subscriptions_subscriptions_reschedule: Claude calculates the epoch timestamp for 7 days from the current billing date and executes the reschedule.
3. loop_subscriptions_subscription_lines_swap: Claude uses the line_id from step 1 and swaps it with shopify-var-777, permanently updating the recurring contract.

Result: The LLM confirms to the user that their next billing date has been successfully delayed by 7 days, and their recurring flavor has been updated to chocolate for all future orders.

Scenario 2: Churn Prevention and Loyalty Intervention

When a customer expresses frustration, the AI can intervene programmatically to save the subscription.

"I am really unhappy with how late my last delivery was. I think I just want to pause my subscription (loop-sub-202) until I figure out what to do. Can you handle that?"

sequenceDiagram
    participant User as Customer
    participant Claude as Claude Agent
    participant Truto as Truto MCP Server
    participant LoopAPI as Loop Subscriptions API

    User->>Claude: "Pause my sub (loop-sub-202) due to late delivery..."
    Claude->>Truto: Call tools/call (pause)
    Truto->>LoopAPI: POST /subscriptions/loop-sub-202/pause
    LoopAPI-->>Truto: 200 OK
    Truto-->>Claude: Success confirmation
    
    Claude->>Truto: Call tools/call (credit_points)
    Note right of Claude: Agent detects frustration<br>and triggers appeasement
    Truto->>LoopAPI: POST /customers/loop-cust-99/loyalty/credit
    LoopAPI-->>Truto: 200 OK
    Truto-->>Claude: Points credited
    
    Claude->>User: "I have paused your subscription. I also credited 500 loyalty points to your account for the inconvenience."```

**Execution Steps:**
1. **`loop_subscriptions_subscriptions_pause`**: Claude executes the pause command immediately to halt future billing, respecting the user's explicit wish.
2. **`get_single_loop_subscriptions_subscription_by_id`**: Claude looks up the subscription to find the associated `customerShopifyId`.
3. **`loop_subscriptions_customer_loyalty_points_credit_points`**: Acting on system prompts to appease frustrated customers, Claude credits 500 points to the customer's loyalty balance.

**Result:** The customer's billing is halted, and proactive loyalty points are credited, providing a seamless support experience without human intervention.

## Security and Access Control

Exposing an e-commerce billing engine to an LLM requires strict security guardrails. Truto's MCP servers provide several mechanisms to scope and secure agent access:

*   **Method Filtering:** You can configure the `config.methods` array during server creation to restrict the LLM to specific operations. Setting this to `["read"]` ensures the agent can only fetch data (like subscription details) but cannot execute destructive mutations like cancellations or swaps.
*   **Tag Filtering:** Use `config.tags` to limit the server to specific resource domains. For example, filtering by `["loyalty"]` restricts the agent to only interacting with loyalty point tools, hiding all core billing modification tools.
*   **Require API Token Auth:** By enabling `config.require_api_token_auth`, the basic tokenized URL is no longer sufficient. The MCP client must also pass a valid Truto API token in the `Authorization` header, adding a required secondary layer of authentication for highly sensitive agents.
*   **Ephemeral Servers:** The `expires_at` field allows you to create temporary MCP servers. Once the ISO datetime passes, the underlying edge storage token is automatically purged by a background cleanup alarm, permanently revoking the agent's access.

## Next Steps

Building custom MCP integration code for Loop Subscriptions means you are signing up to maintain Shopify ID mappings, epoch timestamp calculations, API versioning, and complex state machine logic. By using Truto to dynamically generate your MCP servers, you eliminate the integration codebase entirely.

Your engineering team can focus on refining agent prompts, orchestration logic, and building better customer experiences, rather than parsing JSON responses from billing endpoints.

To see this architecture in action, read our guides on [[architecting multi-tenant MCP servers](/how-to-architect-a-multi-tenant-mcp-server-for-enterprise-b2b-saas/)](/how-to-architect-a-multi-tenant-mcp-server-for-enterprise-b2b-saas/) or [[handling rate limits and pagination at scale](/how-to-normalize-api-pagination-and-error-handling-across-50-integrations/)](/how-to-normalize-api-pagination-and-error-handling-across-50-integrations/).