GPOD-Modulr Integration Guide

GPOD-Modulr Integration Guide

Introduction

This comprehensive guide outlines GPOD's integration with Modulr's financial infrastructure. It provides detailed instructions for implementation, testing, security, and relationship management to ensure a successful partnership.

Important: This guide is designed for GPOD's implementation team, specifically for the 4-week accelerated development plan scheduled for April-May 2025.

Guide Contents

API Integration Guide

This section details the specific Modulr APIs that GPOD will integrate with. Use this as a reference for implementation tasks and requirements.

Authentication & Security

Modulr uses OAuth 2.0 for API authentication. Implementation involves:

  • Registering GPOD application with Modulr to obtain credentials
  • Implementing secure client_id and client_secret storage
  • Using client credentials flow to obtain access tokens
  • Including bearer tokens in all API requests
  • Handling token expiration and refresh
POST https://api-sandbox.modulrfinance.com/api/oauth/token Headers: Content-Type: application/x-www-form-urlencoded Body: grant_type=client_credentials client_id=YOUR_CLIENT_ID client_secret=YOUR_CLIENT_SECRET

Account Management APIs

These APIs enable GPOD to manage virtual accounts for workers, employers, and float funding:

Endpoint Purpose Priority
/accounts Create virtual accounts for stakeholders High
/accounts/{id} Retrieve account details High
/accounts/{id}/balance Get current balance High
/accounts/{id}/transactions Retrieve transaction history Medium
/accounts/{id}/statements Generate account statements Low

Key Account Types

  • Float Account: Main funding pool for EWA payments
  • Employer Accounts: For managing payroll processing
  • Worker Accounts: Virtual accounts for EWA recipients

Payment Processing APIs

These APIs enable the core EWA and payroll functionality:

Endpoint Purpose Priority
/payments Process individual EWA payments High
/payments/{id} Check payment status High
/payments/bulk Process bulk payroll payments High
/payments/scheduled Schedule future payments Low
/directdebits Manage direct debits for float funding Medium

Notification & Webhook APIs

These APIs enable GPOD to receive real-time updates about account and payment activities:

Endpoint Purpose Priority
/webhooks Register webhook endpoints High
/webhooks/{id} Manage webhook configurations Medium
/notifications Retrieve notifications manually Low
Security Note: All webhook endpoints must validate the signature included in webhook payloads to prevent unauthorized requests. Implement proper signature verification using the shared secret.

4-Week Implementation Plan

This accelerated 4-week implementation plan prioritizes essential functionality for a rapid deployment of GPOD's integration with Modulr.
Week 1: Foundation & Authentication (April 24-30)

Key Objectives

  • Design and implement API abstraction layer
  • Build OAuth authentication system with token management
  • Set up development environment with sandbox credentials
  • Create account management base functionality
  • Implement error handling framework
Week 1 Milestone: Successfully authenticate with Modulr sandbox, create test accounts, and verify balances through abstraction layer.
Week 2: Core Payment Processing (May 1-7)

Key Objectives

  • Implement individual payment processing for EWA
  • Build payment status tracking system
  • Set up webhook registration and event handling
  • Create payment notification system
  • Implement basic error recovery for failed payments
Week 2 Milestone: Complete end-to-end EWA payment flow, from initiation to confirmation, with real-time status updates via webhooks.
Week 3: Advanced Features & Bulk Operations (May 8-14)

Key Objectives

  • Implement bulk payment processing for payroll
  • Build comprehensive reconciliation system
  • Develop float management system
  • Create direct debit functionality for float funding
  • Implement transaction reporting and analytics
Week 3 Milestone: Successfully process test bulk payroll run and reconcile all transactions with GPOD's internal records.
Week 4: Testing, Security & Production Readiness (May 15-21)

Key Objectives

  • Complete comprehensive testing of all integration points
  • Implement production security measures
  • Finalize monitoring and alerting system
  • Create production deployment documentation
  • Prepare transition plan from demo to live
Week 4 Milestone: Complete, tested integration ready for Modulr review with full documentation, monitoring, and security measures in place.

Testing Framework

A comprehensive testing strategy is essential for ensuring reliability, security, and accuracy of GPOD's integration with Modulr's financial services.

Unit Testing

Unit tests verify individual components:

  • API client functionality
  • Data transformation logic
  • Error handling mechanisms
  • Business rule implementation

Key Unit Test Areas

  1. Authentication Logic: Test token acquisition, refresh, and handling
  2. Data Validation: Test all input validation rules
  3. Error Handlers: Test all error scenarios and recovery logic
  4. Transformations: Test data mapping between GPOD and Modulr formats

Integration Testing

Integration tests verify:

  • Connectivity with Modulr sandbox environment
  • Complete transaction flows
  • Error handling and recovery
  • Data consistency across systems

Key Integration Test Scenarios

  1. Account Creation Flow: Test end-to-end account creation and validation
  2. Payment Lifecycle: Test full payment flow from initiation to completion
  3. Webhook Processing: Test receipt and handling of webhook notifications
  4. Reconciliation Process: Test transaction matching and discrepancy handling

4-Week Testing Timeline

Week 1: Foundation Testing
  • Create test plan and test cases for authentication
  • Verify OAuth token acquisition and management
  • Test API abstraction layer with mock responses
  • Validate environment configuration and connectivity
Week 2: Payment Flow Testing
  • Test single payment end-to-end flow
  • Verify payment status updates
  • Test webhook receipt and processing
  • Validate basic error handling scenarios
Week 3: Advanced Feature Testing
  • Test bulk payment processing
  • Verify reconciliation processes
  • Test float management functionality
  • Validate reporting and transaction history
Week 4: Integration & Security Testing
  • Perform end-to-end integration testing
  • Conduct security testing and vulnerability assessment
  • Test monitoring and alerting systems
  • Verify production readiness with final validation

Security & Compliance Framework

Financial integrations require rigorous security measures and regulatory compliance. This section outlines GPOD's approach to securing the Modulr integration.

Data Protection

All sensitive data must be protected through:

  • Encryption at rest using AES-256
  • Encryption in transit using TLS 1.2+
  • Secure key management
  • Minimal data retention

API Security

Secure API communications require:

  • IP whitelisting for API access
  • Rate limiting to prevent abuse
  • Request signing and verification
  • Webhook signature validation

Regulatory Compliance

The integration must comply with:

  • FCA requirements for payment processing
  • GDPR for data protection
  • PSD2 for payment services
  • Anti-money laundering regulations
Important: All production implementations must undergo a formal security review before being granted access to live Modulr APIs.

4-Week Security Implementation

Week 1: Security Foundation
  • Implement secure credential storage
  • Set up TLS for all API communications
  • Establish basic logging for security events
  • Create initial security documentation
Week 2: Transaction Security
  • Implement transaction signing and verification
  • Set up secure webhook handling
  • Create data validation rules
  • Implement basic fraud detection measures
Week 3: Compliance Framework
  • Implement audit trail functionality
  • Create GDPR compliance measures
  • Set up regulatory reporting capabilities
  • Develop security breach response procedures
Week 4: Security Hardening
  • Conduct security testing and assessment
  • Implement IP whitelisting and rate limiting
  • Finalize monitoring and alerting for security events
  • Complete security documentation and compliance validation

Relationship Management Strategy

Establishing and maintaining a strong partnership with Modulr is critical for the success of the integration. This section outlines strategies for effective communication and relationship management.

Communication Strategy

Effective communication with Modulr includes:

  • Designated points of contact on both sides
  • Regular technical check-ins
  • Clear escalation paths for issues
  • Documentation sharing and collaboration

Partnership Development

Build a strong partnership by:

  • Understanding Modulr's business goals
  • Aligning with their product roadmap
  • Exploring joint marketing opportunities
  • Providing feedback for platform improvements

4-Week Relationship Timeline

Week 1: Relationship Foundation
  • Establish primary technical contacts at Modulr
  • Set up communication channels (Slack, email, calls)
  • Share initial technical requirements and plans
  • Schedule kick-off meeting and regular check-ins
Week 2: Technical Collaboration
  • Review initial implementation progress with Modulr
  • Seek feedback on authentication and basic payment flows
  • Establish escalation paths for technical issues
  • Document any API limitations or concerns
Week 3: Partnership Deepening
  • Share advanced implementation details and requirements
  • Discuss bulk payment optimization strategies
  • Begin conversations about production go-live
  • Explore potential for case study or joint promotion
Week 4: Launch Preparation
  • Conduct final implementation review with Modulr
  • Establish production support processes
  • Align on monitoring and incident management
  • Create long-term relationship management plan