Which integrations are available for this server?

Integrates with PayPal Sandbox REST APIs and official PayPal MCP tools to manage invoices, orders, payments, captures, refunds, subscriptions, products, disputes, transaction history, receipts, and merchant insights through 82 unified MCP tools.

How do I use PayPal AI Billing MCP Gateway?

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PayPal AI Billing MCP Gateway

by danny121583

Overview Schema Source Related Servers Discussions Admin

TypeScript

Remote

PayPal AI Billing Kit (`v1.9.0`)

AI-Powered Invoicing, Mistake-Recovery Workflows, Conversational Authorization, Automated Sandbox Card Checkout, Merchant-Branded PDF Receipts & Unified 82-Tool Model Context Protocol (MCP) Gateway for PayPal Sandbox.

License: MIT Live Demo Unified MCP Gateway OpenAPI 3.1.0

Live Public Endpoints

Endpoint	Public URL	Purpose
Web Application (Vercel)	`https://paypal-ai-billing-kit.vercel.app`	Interactive Provider & Customer Billing Dashboard (Desktop & Mobile Web)
Dedicated Unified MCP Gateway (Cloudflare Worker)	`https://paypal-ai-billing-mcp.apd1034.workers.dev/mcp`	Primary JSON-RPC 2.0 MCP Server (`POST` & `GET`) exposing 82 unified tools for ChatGPT MCP, Claude Desktop, and MCP Inspector
Vercel MCP Mirror	`https://paypal-ai-billing-kit.vercel.app/api/mcp`	Mirror JSON-RPC 2.0 MCP endpoint
OpenAPI 3.1.0 Spec	`https://paypal-ai-billing-mcp.apd1034.workers.dev/api/openapi.json`	Machine-readable OpenAPI 3.1.0 schema for ChatGPT Custom GPT Actions
Interactive MCP Docs	`https://paypal-ai-billing-mcp.apd1034.workers.dev/docs/mcp`	Human-readable MCP documentation and curl examples
Downloadable PDF Receipt API (Sample Link)	`https://paypal-ai-billing-mcp.apd1034.workers.dev/api/receipts/PPB-INV-2026-1003.pdf`	Sample PDF 1.4 receipt (`#PPB-INV-2026-1003`) for instant viewing; every PayPal Sandbox transaction dynamically generates its own unique receipt via `/api/receipts/:invoice_number.pdf` (`Content-Type: application/pdf`)

Related MCP server: Braintree MCP Server

Overview

PayPal AI Billing Kit is a standalone, open-source AI billing and payment application built for the PayPal AI Hackathon 2026. It pairs a multi-role Billing Dashboard (Provider & Customer perspectives) with an in-app Gemini 3.5 Flash-Lite Billing AI Assistant (thinkingLevel: "MEDIUM") and a Unified 82-Tool Model Context Protocol (MCP) Gateway connected to PayPal Sandbox REST v1/v2/v3 APIs (api-m.sandbox.paypal.com) and Official PayPal MCP Discovery (mcp.sandbox.paypal.com/sse).

Key Capabilities

Unified 82-Tool MCP Gateway (https://paypal-ai-billing-mcp.apd1034.workers.dev/mcp):
- 21 Native Application Tools (source: "native_application"): Customer lookup, invoice search, balance explanation, transaction history, structured + PDF receipts (get_payment_receipt, generate_receipt_pdf), session-isolated audit logs, business metrics, proposal creation, real PayPal Sandbox wallet & card order creation/capture/refund, unpaid invoice voiding, and conversational command execution.
- 47 Official PayPal MCP Tools (source: "official_paypal_mcp"): paypal_discover_official_mcp plus all 46 official PayPal MCP tools registered by their exact official names (create_invoice, create_recurring_series, activate_recurring_series, get_recurring_series, cancel_recurring_series, delete_recurring_series, list_invoices, get_invoice, send_invoice, send_invoice_reminder, cancel_sent_invoice, delete_invoice, setup_invoice_auto_reminders, update_invoice_auto_reminder, search_invoicing, update_invoicing, cancel_invoice_auto_reminder, generate_invoice_qr_code, generate_invoice_number, record_payment_for_invoice, record_refund_for_invoice, create_conditional_rules_for_invoice, create_product, list_products, update_product, show_product_details, create_subscription_plan, list_subscription_plans, show_subscription_plan_details, create_subscription, show_subscription_details, cancel_subscription, update_subscription, create_shipment_tracking, get_shipment_tracking, update_shipment_tracking, create_order, get_order, pay_order, list_disputes, get_dispute, accept_dispute_claim, list_transactions, create_refund, get_refund, get_merchant_insights).
- 14 PayPal Sandbox REST-to-MCP Adapter Tools (source: "paypal_rest_adapter"): 8 existing (paypal_get_order, paypal_get_refund, paypal_list_invoices, paypal_generate_invoice_number, paypal_list_disputes, paypal_check_card_eligibility, execute_sandbox_card_payment, run_sandbox_card_lifecycle_test) + 6 new (update_plan, paypal_authorize_order, paypal_list_webhooks, paypal_list_webhook_event_types, paypal_list_invoice_templates, paypal_create_vault_setup_token).
- Permission Tiers: 39 read_only, 3 proposal_only, and 40 confirmed_demo_write.
Automated Server-Side PayPal Sandbox Direct-Card Checkout (Orders v2 payment_source.card):
- Alongside standard PayPal Wallet Checkout (PAYER_ACTION_REQUIRED → buyer approval URL) and explicitly labeled Demo Settlement Simulation, supports server-side PayPal Sandbox card payments using allowlisted developer test card profiles (visa_sandbox, mastercard_sandbox, amex_sandbox, decline_refused, decline_expired, decline_insufficient_funds) for automated Order → Capture → Receipt → Refund verification without exposing or accepting raw card numbers (RAW_CARD_CREDENTIALS_FORBIDDEN).
8-State Payment-Attempt Classification & Session-Isolated Audit Trail:
- Distinguishes awaiting_buyer_approval, approval_required (ORDER_NOT_APPROVED), payment_declined, buyer_canceled, authorized, captured, refunded, and processing_error so premature capture attempts never inflate declined-card metrics.
- Enforces strict session and role isolation on get_financial_audit_history (canonical_seed vs session_private).
Dual Authorization Model (Cryptographic Proposals + Conversational Authorization):
- HMAC-SHA256 Proposal Tokens (PPB-PROP-1...): Server-persisted in public.billing_ai_action_proposals with 30-minute expiration, parameter binding, and single-use consumption.
- Explicit Conversational Authorization (evaluateConversationalAuthorization): Direct user instructions (e.g., "Create a $35 invoice for Alex Rivera for immunization", "Pay Alex Rivera's $35 invoice", "Refund $20 on invoice PPB-INV-2026-1003", "Void unpaid invoice PPB-INV-2026-1001") execute immediately within $500 single-action and $2,500 daily guardrails, while capability questions ("Can you refund invoices?") and hypothetical questions ("What would happen if I paid?") never trigger writes.
Real End-to-End PayPal Sandbox Payments & Refunds:
- Creates real PayPal Sandbox Orders (POST /v2/checkout/orders), enforces genuine buyer approval on sandbox.paypal.com, captures payments (POST /v2/checkout/orders/{id}/capture), and executes partial or full refunds (POST /v2/payments/captures/{id}/refund).
Professional Merchant-Branded PDF 1.4 Receipts:
- Dynamically generates a unique, merchant-first downloadable PDF receipt (GET /api/receipts/:invoice_number.pdf) and base64-encoded PDF inside get_payment_receipt and generate_receipt_pdf for every paid or refunded statement (#PPB-INV-2026-1003.pdf is provided above as a sample PDF for quick viewing, while all live PayPal Sandbox transactions generate their own unique receipt with their real PayPal Order, Capture, and Refund IDs). Features Jenkins Wellness & Telehealth Practice (Provider: Dr. Sarah Jenkins), distinct state titles (Payment Receipt — Paid, Payment & Refund Receipt — Refunded, Payment Receipt — Partially Refunded, Sample Demo Receipt — Not a Real PayPal Payment), card brand & last 4 digits, "Payment processed through PayPal" attribution, and "This receipt was generated electronically. Please retain it for your records." footer.

Connecting ChatGPT MCP to PayPal AI Billing Kit

Open ChatGPT → Settings → Connectors / Developer Mode (MCP).
Add a new MCP Server with:
- MCP Server URL: https://paypal-ai-billing-mcp.apd1034.workers.dev/mcp
- Authentication: None required for isolated visitor demo sessions (or OAuth 2.0 auto-discovered via /.well-known/oauth-authorization-server).
Refresh the connector and try these prompts directly in ChatGPT:

Show me Alex Rivera's pending invoices.
Explain Jordan Taylor's failed payment.
Create a $35 invoice for Alex Rivera for immunization.
Prepare payment for Alex Rivera's $35 invoice.
Pay Alex Rivera's $35 invoice PPB-INV-2026-1002.
Give me the payment receipt and PDF download link for PPB-INV-2026-1003.
Refund $15 on invoice PPB-INV-2026-1003.
Inspect PayPal Sandbox order 4G312456A5669123W using paypal_get_order.
Show me the financial audit history.

Application Walkthrough & Screenshots (`docs/screenshots/`)

1. Provider Dashboard & Connected PayPal Sandbox Status

Provider Dashboard

2. Customer Perspectives (Alex Rivera & Jordan Taylor)

Alex Rivera (Pending & Paid Invoices)	Jordan Taylor (Failed Payment & Recovery)

3. Invoice Creation & PayPal Sandbox Connection Controls

Create Invoice Modal	PayPal Sandbox Connected	PayPal Sandbox Disconnected

Failed Payment Retry (`#PPB-INV-2026-1004`)	Billing AI Assistant

Unified MCP Agent Interface (82 Tools)	Financial Guardrails & Audit Trail

Complete 82-Tool Unified MCP Reference (21 Native + 47 Official PayPal MCP + 14 PayPal REST Adapters)

Tier 1 — Read-Only Discovery, Receipts & PayPal Sandbox Inspection (39 Tools)

Tool Name	Source	Description
`discover_billing_capabilities`	`native_application`	Returns system capabilities, guardrails (`$500` single / `$2,500` daily), and 82-tool catalog.
`list_demo_customers`	`native_application`	Lists fictional demo customers (`Alex Rivera`, `Jordan Taylor`) and provider (`Dr. Sarah Jenkins`).
`search_invoices`	`native_application`	Filters invoices by customer name, status (`sent`, `paid`, `partially_refunded`, `refunded`, `failed`, `void`), or query.
`get_invoice_details`	`native_application`	Returns full line-item breakdown, PayPal Order/Capture IDs, payment transactions, and refund history.
`explain_outstanding_balances`	`native_application`	Summarizes unpaid balances, overdue invoices, and failed payment recovery steps.
`get_transaction_history`	`native_application`	Lists PayPal Order creations, captures, refunds, and failure diagnostics.
`get_payment_receipt`	`native_application`	Generates a structured payment receipt plus downloadable PDF URL (`pdf_download_url`) and `pdf_base64`.
`generate_receipt_pdf`	`native_application`	Generates and validates a binary PDF 1.4 receipt for a paid or refunded statement (refuses unpaid invoices).
`get_financial_audit_history`	`native_application`	Lists session-isolated append-only audit entries from `billing_audit_events`.
`get_paypal_sandbox_status`	`native_application`	Verifies live PayPal Sandbox OAuth 2.0 connectivity and merchant connection status.
`get_business_metrics`	`native_application`	Computes total invoiced, collected, outstanding, refunded, and genuine failed payment metrics.
`paypal_discover_official_mcp`	`official_paypal_mcp`	Probes PayPal's official remote MCP server (`mcp.sandbox.paypal.com/sse`), OAuth metadata, and 46-tool catalog.
`get_recurring_series`	`official_paypal_mcp`	Retrieves a recurring invoice series by ID (`GET /v2/invoicing/recurring-invoices/{id}`).
`list_invoices`	`official_paypal_mcp`	Lists invoices from PayPal Invoicing v2 with pagination (`GET /v2/invoicing/invoices`).
`get_invoice`	`official_paypal_mcp`	Retrieves a PayPal Sandbox invoice by ID (`GET /v2/invoicing/invoices/{id}`).
`search_invoicing`	`official_paypal_mcp`	Searches PayPal invoices or recurring series (`POST /v2/invoicing/search-invoices` / `search-recurring-invoices`).
`generate_invoice_qr_code`	`official_paypal_mcp`	Generates a QR code image payload for a PayPal invoice (`POST /v2/invoicing/invoices/{id}/generate-qr-code`).
`generate_invoice_number`	`official_paypal_mcp`	Generates the next sequential PayPal invoice number (`POST /v2/invoicing/generate-next-invoice-number`).
`list_products`	`official_paypal_mcp`	Lists PayPal Catalog Products (`GET /v1/catalogs/products`).
`show_product_details`	`official_paypal_mcp`	Retrieves details of a PayPal Catalog Product (`GET /v1/catalogs/products/{id}`).
`list_subscription_plans`	`official_paypal_mcp`	Lists PayPal Subscription Plans (`GET /v1/billing/plans`).
`show_subscription_plan_details`	`official_paypal_mcp`	Retrieves PayPal Subscription Plan details (`GET /v1/billing/plans/{id}`).
`show_subscription_details`	`official_paypal_mcp`	Retrieves PayPal Subscription details (`GET /v1/billing/subscriptions/{id}`).
`get_shipment_tracking`	`official_paypal_mcp`	Retrieves shipment tracking information (`GET /v1/shipping/trackers`; requires shipping scope).
`get_order`	`official_paypal_mcp`	Retrieves PayPal Checkout Order details (`GET /v2/checkout/orders/{id}`).
`list_disputes`	`official_paypal_mcp`	Lists PayPal Customer Disputes (`GET /v1/customer/disputes`).
`get_dispute`	`official_paypal_mcp`	Retrieves details of a specific PayPal dispute (`GET /v1/customer/disputes/{id}`).
`list_transactions`	`official_paypal_mcp`	Lists PayPal Reporting Transactions (`GET /v1/reporting/transactions`; requires reporting scope).
`get_refund`	`official_paypal_mcp`	Retrieves details of a PayPal Refund (`GET /v2/payments/refunds/{id}`).
`get_merchant_insights`	`official_paypal_mcp`	Retrieves PayPal Merchant Insights (`GET /v1/merchant/insights`; unsupported in Sandbox mode).
`paypal_get_order`	`paypal_rest_adapter`	Fetches a live PayPal Sandbox Order (`GET /v2/checkout/orders/{id}`).
`paypal_get_refund`	`paypal_rest_adapter`	Fetches a live PayPal Sandbox Refund (`GET /v2/payments/refunds/{id}`).
`paypal_list_invoices`	`paypal_rest_adapter`	Lists invoices from the PayPal Sandbox Invoicing v2 API (`GET /v2/invoicing/invoices`).
`paypal_generate_invoice_number`	`paypal_rest_adapter`	Generates the next PayPal Sandbox invoice number (`POST /v2/invoicing/generate-next-invoice-number`).
`paypal_list_disputes`	`paypal_rest_adapter`	Lists customer disputes from the PayPal Sandbox Disputes API (`GET /v1/customer/disputes`).
`paypal_check_card_eligibility`	`paypal_rest_adapter`	Checks merchant eligibility for PayPal Sandbox Orders v2 `payment_source.card` and lists safe test card profiles.
`paypal_list_webhooks`	`paypal_rest_adapter`	Lists configured PayPal Sandbox Webhooks (`GET /v1/notifications/webhooks`).
`paypal_list_webhook_event_types`	`paypal_rest_adapter`	Lists all subscribed/available PayPal Sandbox Webhook Event Types (`GET /v1/notifications/webhooks-event-types`).
`paypal_list_invoice_templates`	`paypal_rest_adapter`	Lists merchant PayPal Invoicing v2 Templates (`GET /v2/invoicing/templates`).

Tier 2 — Proposal-Only (3 Tools)

Tool Name	Source	Description
`create_invoice_proposal`	`native_application`	Validates guardrails and issues a signed `proposal_id` (`PPB-PROP-1...`) to create an invoice.
`prepare_payment_proposal`	`native_application`	Issues a signed `proposal_id` (`PPB-PROP-1...`) to initiate PayPal Sandbox checkout.
`prepare_refund_proposal`	`native_application`	Validates refundable balance and issues a signed `proposal_id` (`PPB-PROP-1...`) for a refund.

Tier 3 — Confirmed Financial Workflows, Official PayPal MCP Writes & REST-to-MCP Adapters (40 Tools)

Tool Name	Source	Description
`create_approved_invoice`	`native_application`	Persists a new invoice using either a signed `proposal_id` or an explicit `user_instruction`.
`create_paypal_checkout_order`	`native_application`	Creates a real PayPal Sandbox Order (`v2/checkout/orders`) and returns the `checkout_approval_url`.
`capture_paypal_checkout_order`	`native_application`	Captures an approved PayPal Sandbox Order (`v2/checkout/orders/{id}/capture`) and classifies `ORDER_NOT_APPROVED` as `approval_required`.
`execute_sandbox_card_payment`	`paypal_rest_adapter`	Executes a real server-side PayPal Sandbox card payment (`payment_source.card`) using allowlisted Sandbox card profiles.
`run_sandbox_card_lifecycle_test`	`paypal_rest_adapter`	Runs a complete isolated 7-step PayPal Sandbox card lifecycle test (`Invoice → Order → Capture → Verify → Receipt → Refund → Verify`).
`execute_approved_refund`	`native_application`	Executes a PayPal Sandbox Refund (`v2/payments/captures/{id}/refund`) via `proposal_id` or `user_instruction`.
`void_unpaid_invoice`	`native_application`	Voids an unpaid invoice (`draft`, `sent`, `overdue`, `failed`) via `proposal_id` or `user_instruction`.
`execute_conversational_instruction`	`native_application`	Evaluates a natural-language instruction with `evaluateConversationalAuthorization` and executes authorized actions.
`reset_demo_session`	`native_application`	Resets the caller's isolated `demo_session_id` back to the clean 6-invoice canonical baseline.
`create_invoice`	`official_paypal_mcp`	Creates a draft invoice in PayPal Invoicing v2 (`POST /v2/invoicing/invoices`).
`create_recurring_series`	`official_paypal_mcp`	Creates a draft recurring invoice series (`POST /v2/invoicing/recurring-invoices`).
`activate_recurring_series`	`official_paypal_mcp`	Activates a draft recurring invoice series (`POST /v2/invoicing/recurring-invoices/{id}/activate`).
`cancel_recurring_series`	`official_paypal_mcp`	Cancels an active recurring invoice series (`POST /v2/invoicing/recurring-invoices/{id}/cancel`).
`delete_recurring_series`	`official_paypal_mcp`	Deletes a draft recurring invoice series (`DELETE /v2/invoicing/recurring-invoices/{id}`).
`send_invoice`	`official_paypal_mcp`	Sends a draft PayPal invoice to its recipient (`POST /v2/invoicing/invoices/{id}/send`).
`send_invoice_reminder`	`official_paypal_mcp`	Sends a reminder for a sent PayPal invoice (`POST /v2/invoicing/invoices/{id}/remind`).
`cancel_sent_invoice`	`official_paypal_mcp`	Cancels a sent PayPal invoice (`POST /v2/invoicing/invoices/{id}/cancel`).
`delete_invoice`	`official_paypal_mcp`	Deletes a draft PayPal invoice (`DELETE /v2/invoicing/invoices/{id}`).
`setup_invoice_auto_reminders`	`official_paypal_mcp`	Initializes merchant automatic invoice reminder configurations (`POST /v2/invoicing/setup-reminders`).
`update_invoice_auto_reminder`	`official_paypal_mcp`	Updates an invoice auto-reminder configuration (`PUT /v2/invoicing/reminders/{id}`).
`update_invoicing`	`official_paypal_mcp`	Replaces a PayPal invoice or recurring series (`PUT /v2/invoicing/invoices/{id}` / `recurring-invoices/{id}`).
`cancel_invoice_auto_reminder`	`official_paypal_mcp`	Cancels automatic reminders on a sent PayPal invoice (`POST /v2/invoicing/invoices/{id}/cancel-reminders`).
`record_payment_for_invoice`	`official_paypal_mcp`	Records an external payment on a PayPal invoice (`POST /v2/invoicing/invoices/{id}/payments`).
`record_refund_for_invoice`	`official_paypal_mcp`	Records an external refund on a PayPal invoice (`POST /v2/invoicing/invoices/{id}/refunds`).
`create_conditional_rules_for_invoice`	`official_paypal_mcp`	Creates conditional payment rules on a PayPal invoice (`POST /v2/invoicing/invoices/{id}/conditional-rules`).
`create_product`	`official_paypal_mcp`	Creates a PayPal Catalog Product (`POST /v1/catalogs/products`).
`update_product`	`official_paypal_mcp`	Patches a PayPal Catalog Product (`PATCH /v1/catalogs/products/{id}`).
`create_subscription_plan`	`official_paypal_mcp`	Creates a PayPal Subscription Plan (`POST /v1/billing/plans`).
`create_subscription`	`official_paypal_mcp`	Creates a PayPal Subscription (`POST /v1/billing/subscriptions`).
`cancel_subscription`	`official_paypal_mcp`	Cancels a PayPal Subscription (`POST /v1/billing/subscriptions/{id}/cancel`).
`update_subscription`	`official_paypal_mcp`	Patches a PayPal Subscription (`PATCH /v1/billing/subscriptions/{id}`).
`create_shipment_tracking`	`official_paypal_mcp`	Creates shipment tracking info (`POST /v1/shipping/trackers-batch`; requires shipping scope).
`update_shipment_tracking`	`official_paypal_mcp`	Updates shipment tracking info (`PUT /v1/shipping/trackers/{id}`; requires shipping scope).
`create_order`	`official_paypal_mcp`	Creates a PayPal Checkout Order (`POST /v2/checkout/orders`).
`pay_order`	`official_paypal_mcp`	Captures an approved PayPal Checkout Order (`POST /v2/checkout/orders/{id}/capture`).
`accept_dispute_claim`	`official_paypal_mcp`	Accepts liability for a PayPal Customer Dispute (`POST /v1/customer/disputes/{id}/accept-claim`).
`create_refund`	`official_paypal_mcp`	Refunds a captured PayPal payment (`POST /v2/payments/captures/{id}/refund`).
`update_plan`	`paypal_rest_adapter`	Patches a PayPal Subscription Plan (`PATCH /v1/billing/plans/{plan_id}`).
`paypal_authorize_order`	`paypal_rest_adapter`	Authorizes an `intent: "AUTHORIZE"` PayPal Checkout Order (`POST /v2/checkout/orders/{id}/authorize`).
`paypal_create_vault_setup_token`	`paypal_rest_adapter`	Creates a PayPal Payment Method Tokens v3 setup token (`POST /v3/vault/setup-tokens`).

Local Setup & Verification Suite

# 1. Install dependencies
npm install

# 2. Run Jest unit tests (SDK, Conversational Auth, Unified 82-Tool MCP Registry, PDF Receipts)
npm test -- --watchAll=false

# 3. Verify all 82 Unified MCP Tools (46 Official PayPal MCP + 14 REST Adapters + 21 Native) against live PayPal Sandbox
npm run verify:full-paypal-mcp

# 4. Run full 25-stage automated PayPal Sandbox, MCP, Card Lifecycle & Security verification
npm run verify:paypal-full

# 5. Verify all 82 Unified MCP Gateway tools against Cloudflare Worker + Supabase + Vercel
npm run verify:mcp

# 6. Verify Gemini 3.5 Flash-Lite AI, Proposal Security, Guardrails & Conversational Authorization
npm run verify:ai-security

# 7. Run Playwright E2E browser verification against live Vercel deployment
npm run verify:e2e

# 8. Run secret & project isolation scan
npm run scan:secrets

See docs/UNIFIED_MCP_AND_SECURITY_ARCHITECTURE.md for the complete architectural and security specification.

License

MIT License — see LICENSE.

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