PayPal Financial Gateway Service (PFGS)

Maintained by DynamicEndpoints | Support Contact: kameron@dynamicendpoints.com

This Model Context Protocol (MCP) server abstracts PayPal's expansive set of Application Programming Interfaces (APIs) into a unified, easily consumable interface. It is engineered to streamline commercial activities, encompassing payment orchestration, ledger reconciliation, and resource provisioning via PayPal infrastructure.

System Blueprint (Architecture Diagram)

mermaid graph TD subgraph "Client Application Layer" UserAgent[External Consumer] PFGS_Server[PFGS Gateway Service] InputGuard[Request Sanitization & Schema Enforcement] AuthModule[OAuth 2.0 Token Acquisition] end

subgraph "PayPal Ecosystem Endpoints"
    OrderMgmt[Orders & Sales API]
    PaymentCore[Payment Execution API]
    FundTransfer[Payouts & Disbursement API]
    Billing[Invoicing & Billing API]
    Catalog[Product Catalog Services]
    DisputeRes[Dispute Resolution Interface]
    IdentitySvc[User Verification & Profile Service]
end

UserAgent --> |API Call| PFGS_Server
PFGS_Server --> InputGuard
PFGS_Server --> AuthModule
AuthModule --> |Secure Token| PayPal_Auth_Layer[PayPal Authorization Realm]

PFGS_Server --> OrderMgmt
PFGS_Server --> PaymentCore
PFGS_Server --> FundTransfer
PFGS_Server --> Billing
PFGS_Server --> Catalog
PFGS_Server --> DisputeRes
PFGS_Server --> IdentitySvc

style UserAgent fill:#f9f,stroke:#333,stroke-width:2px
style PFGS_Server fill:#bbf,stroke:#333,stroke-width:2px
style AuthModule fill:#bfb,stroke:#333,stroke-width:2px
style InputGuard fill:#bfb,stroke:#333,stroke-width:2px

Core Capabilities

• Transaction Facilitation
• Order initialization and finalization (Capture/Authorize)
• Direct financial instrument processing

• Management of payment objections (Disputes)

• Commercial Resource Management

• Inventory item definition (Products)
• Formal billing document generation (Invoices)
• Mass fund distribution (Payouts)

• Partner tracking mechanisms

• Identity & Access Verification

• Validation of end-user credentials/identity
• Retrieval of associated user metadata
• Customization of client-side experience profiles

Deployment Procedures

Automated Provisioning (Smithery)

For rapid integration within compatible environments (e.g., Claude Desktop), utilize the Smithery CLI:

bash npx -y @smithery/cli install @DynamicEndpoints/Paypal-MCP --client claude

Manual Setup Guide

1. Obtain the source code repository.

2. Install requisite software packages: bash npm install

3. Compile the source code: bash npm run build

4. Configure credentials within the hosting environment's configuration file:

{ "mcpServers": { "paypal": { "command": "node", "args": ["path/to/paypal-server/build/index.js"], "env": { "PAYPAL_CLIENT_ID": "your_application_identifier", "PAYPAL_CLIENT_SECRET": "your_secure_credential" }, "disabled": false, "autoApprove": [] } } }

Available Function Endpoints

Transactional Services

generate_payment_instrument_token

Secures a token representing a customer's funding source for later transaction application. typescript { customer: { id: string; email_address?: string; }; payment_source: { card?: { name: string; number: string; expiry: string; security_code: string; }; paypal?: { email_address: string; }; }; }

initiate_financial_order

Registers a purchase commitment with PayPal for later settlement. typescript { intent: 'CAPTURE' | 'AUTHORIZE'; purchase_units: Array<{ amount: { currency_code: string; value: string; }; description?: string; reference_id?: string; }>; }

execute_direct_payment

Completes a real-time payment using specified funding details. typescript { intent: string; payer: { payment_method: string; funding_instruments?: Array<{ credit_card?: { number: string; type: string; expire_month: number; expire_year: number; cvv2: string; first_name: string; last_name: string; }; }>; }; transactions: Array<{ amount: { total: string; currency: string; }; description?: string; }>; }

Commercial Operations

register_catalog_item

Adds a new sellable asset or service to the integrated product registry. typescript { name: string; description: string; type: 'PHYSICAL' | 'DIGITAL' | 'SERVICE'; category: string; image_url?: string; home_url?: string; }

issue_billing_document

Creates and distributes a formal invoice to a specified recipient. typescript { invoice_number: string; reference: string; currency_code: string; recipient_email: string; items: Array<{ name: string; quantity: string; unit_amount: { currency_code: string; value: string; }; }>; }

process_bulk_disbursement

Initiates a scheduled distribution of funds to multiple recipients. typescript { sender_batch_header: { sender_batch_id: string; email_subject?: string; recipient_type?: string; }; items: Array<{ recipient_type: string; amount: { value: string; currency: string; }; receiver: string; note?: string; }>; }

Identity & Configuration

fetch_account_details

Retrieves fundamental authenticated user profile data. typescript { access_token: string; }

establish_web_interface_profile

Configures the visual and functional parameters for client-side transaction flows. typescript { name: string; presentation?: { brand_name?: string; logo_image?: string; locale_code?: string; }; input_fields?: { no_shipping?: number; address_override?: number; }; flow_config?: { landing_page_type?: string; bank_txn_pending_url?: string; }; }

Operational Demonstrations (Usage)

Committing a Purchase

typescript const purchaseResult = await mcpClient.useTool('paypal', 'initiate_financial_order', { intent: 'CAPTURE', purchase_units: [{ amount: { currency_code: 'USD', value: '100.00' }, description: 'Premium Subscription' }] });

Issuing an Invoice

typescript const invoiceResult = await mcpClient.useTool('paypal', 'issue_billing_document', { invoice_number: 'INV-2024-001', reference: 'REF-2024-001', currency_code: 'USD', recipient_email: 'customer@example.com', items: [{ name: 'Consulting Services', quantity: '1', unit_amount: { currency_code: 'USD', value: '500.00' } }] });

Executing Payroll Disbursement

typescript const payoutResult = await mcpClient.useTool('paypal', 'process_bulk_disbursement', { sender_batch_header: { sender_batch_id: 'Payroll_2024_001', email_subject: 'You have received a payment' }, items: [{ recipient_type: 'EMAIL', amount: { value: '1000.00', currency: 'USD' }, receiver: 'employee@example.com', note: 'Monthly salary payment' }] });

Exception Management

The service incorporates thorough error handling protocols:

• Detailed schema violation feedback upon input anomalies.
• Direct translation and reporting of upstream PayPal API failures.
• Robust mitigation for network instability and authentication failures.
• Circuit breaking mechanisms for rate limiting and timeouts.

Security Posture

• Strict input sanitization across all parameters.
• Reliance on secure OAuth 2.0 credential flows.
• Confidential credentials secured via environment variable injection.
• Defense against sensitive data leakage in error responses.

Maintenance & Development Cycle

Build Artifact Generation

bash npm run build

Unit & Integration Testing

bash npm test

Diagnostic Logging

Detailed operational output is directed to standard output, covering: - Token acquisition status. - Failures during external API invocation. - Parameter validation deviations. - Request/response tracing (when enabled).

Contributions

We welcome external contributions: 1. Clone the primary repository. 2. Establish a dedicated feature branch. 3. Integrate modifications and commit changes. 4. Submit a Pull Request for review.

Licensing

This project is distributed under the MIT License.

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