care-api/.specify/specs/care-api.md

KiviCare REST API Plugin - Feature Specification

Status: Draft
Created: 2025-09-12
Last Updated: 2025-09-12
Branch: spec/care-api
Assignee: AikTop (ID: 25)

📋 Executive Summary

The KiviCare REST API Plugin provides comprehensive REST API access to all KiviCare healthcare management system functionality through a secure, authenticated WordPress plugin. This system enables third-party applications, mobile apps, and external integrations to programmatically interact with patient records, appointments, clinical data, and billing information while maintaining strict security and compliance standards.

🎯 Objectives

Primary Objectives

• Complete API Coverage: Expose all 35 KiviCare database entities through REST endpoints
• Enterprise Security: Implement JWT authentication with role-based access control
• WordPress Integration: Native plugin architecture with hooks, filters, and admin interface
• Developer Experience: Comprehensive API documentation with SDK libraries

Secondary Objectives

• High Performance: Sub-200ms response times with caching strategies
• Audit Compliance: Complete activity logging for healthcare compliance (HIPAA considerations)
• Monitoring & Analytics: Real-time API usage metrics and health monitoring
• Multi-tenant Support: Support multiple clinic installations

📖 User Stories

As a Healthcare Application Developer

• I want to authenticate securely and access patient data via REST API
• So that I can build custom healthcare applications integrated with KiviCare
• Given I have valid API credentials
• When I make authenticated requests to patient endpoints
• Then I receive structured JSON data with proper HTTP status codes

As a Clinic Administrator

• I want to control which external applications can access our data
• So that patient privacy and compliance requirements are maintained
• Given I have admin access to the WordPress dashboard
• When I configure API permissions and generate API keys
• Then only authorized applications can access specific data endpoints

As a Mobile App Developer

• I want to access appointment scheduling and patient lookup functionality
• So that I can create mobile applications for patients and staff
• Given I have mobile app credentials
• When I integrate with appointment and patient endpoints
• Then I can build responsive mobile interfaces for healthcare workflows

🔧 Technical Requirements

Functional Requirements

1. Authentication System: JWT-based authentication with refresh tokens and role-based access
2. CRUD Operations: Complete Create, Read, Update, Delete operations for all KiviCare entities
3. Data Validation: Comprehensive input validation and sanitization for all endpoints
4. Error Handling: Structured error responses with proper HTTP status codes
5. Rate Limiting: Configurable rate limiting to prevent API abuse
6. Audit Logging: Complete activity logs for compliance and monitoring

Non-Functional Requirements

1. Performance: 95th percentile response time < 200ms under normal load
2. Security: OWASP Top 10 compliance, SQL injection prevention, XSS protection
3. Scalability: Support for 1000+ concurrent users with horizontal scaling capability
4. Reliability: 99.9% uptime with graceful failure handling and circuit breakers

API Specification

Base URL: /wp-json/kivicare-api/v1/
Authentication: Bearer JWT Token
Content-Type: application/json
Rate Limit: 1000 requests/hour per API key
Response Format: JSON with consistent structure
Error Format: RFC 7807 Problem Details

📊 Database Schema

No New Tables Required

The plugin integrates with existing KiviCare schema (35 tables):

• Core: kc_patients, kc_doctors, kc_appointments, kc_clinics
• Clinical: kc_encounters, kc_prescriptions, kc_medical_records
• Billing: kc_bills, kc_services, kc_payments
• System: kc_users, kc_roles, kc_settings

Schema Enhancements

-- Add API tracking columns to existing tables (optional)
ALTER TABLE wp_kc_appointments ADD COLUMN api_created_at TIMESTAMP NULL;
ALTER TABLE wp_kc_appointments ADD COLUMN api_modified_at TIMESTAMP NULL;
ALTER TABLE wp_kc_appointments ADD COLUMN api_source VARCHAR(50) NULL;

-- API Keys table for authentication
CREATE TABLE wp_kc_api_keys (
    id BIGINT AUTO_INCREMENT PRIMARY KEY,
    user_id BIGINT NOT NULL,
    api_key VARCHAR(64) NOT NULL UNIQUE,
    secret_key VARCHAR(64) NOT NULL,
    name VARCHAR(100) NOT NULL,
    permissions JSON,
    last_used_at TIMESTAMP NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    expires_at TIMESTAMP NULL,
    is_active BOOLEAN DEFAULT TRUE,
    INDEX idx_api_key (api_key),
    INDEX idx_user_id (user_id)
);

🏗️ Architecture

System Components

• Authentication Layer: JWT token management, user validation, permission checking
• API Controller Layer: RESTful endpoint handlers, request routing, response formatting
• Service Layer: Business logic, data validation, KiviCare integration
• Data Access Layer: WordPress database abstraction, query optimization
• Security Layer: Rate limiting, input sanitization, audit logging

Data Flow

1. Request Reception: WordPress REST API receives authenticated request
2. Authentication: JWT token validation and user permission checking
3. Route Processing: Request routed to appropriate API controller
4. Business Logic: Service layer processes request with validation
5. Data Access: Secure database operations via WordPress $wpdb
6. Response Formation: Structured JSON response with proper HTTP codes

Integration Points

• WordPress Core: Uses WP REST API framework and authentication hooks
• KiviCare Plugin: Integrates with existing KiviCare database schema and business logic
• External Applications: RESTful API consumption via HTTP/HTTPS protocols

🔒 Security Considerations

Authentication & Authorization

• JWT Authentication: Secure token-based authentication with configurable expiration
• Role-Based Access Control (RBAC): Granular permissions per user role and endpoint
• API Key Management: Secure API key generation, rotation, and revocation
• Session Management: Stateless authentication with refresh token capability

Data Protection

• Input Sanitization: WordPress sanitization functions for all user inputs
• SQL Injection Prevention: Exclusive use of prepared statements via $wpdb
• XSS Protection: Output escaping and Content Security Policy headers
• Data Encryption: Sensitive data encryption at rest and in transit (HTTPS)

Vulnerability Mitigation

• Rate Limiting: Prevents brute force attacks and API abuse
• CORS Configuration: Proper Cross-Origin Resource Sharing policies
• Request Size Limits: Protection against large payload attacks
• Audit Logging: Complete request/response logging for security monitoring

🧪 Testing Strategy

Unit Tests

• Model Layer Testing: Test all KiviCare entity models and data validation
• Service Layer Testing: Business logic and KiviCare integration testing
• Authentication Testing: JWT token generation, validation, and expiration
• API Controller Testing: Endpoint routing, request handling, response formatting

Integration Tests

• Database Integration: WordPress database operations and KiviCare schema interaction
• WordPress Integration: Plugin activation, deactivation, and REST API framework
• Authentication Flow: End-to-end authentication and authorization workflows
• Permission Testing: Role-based access control across all endpoints

End-to-End Tests

• API Workflow Testing: Complete user journeys from authentication to data access
• Multi-user Testing: Concurrent access scenarios with different user roles
• Error Scenario Testing: Network failures, invalid data, and edge cases
• Performance Testing: Load testing with realistic healthcare data volumes

Performance Tests

• Load Testing: 1000+ concurrent users with typical healthcare API usage patterns
• Stress Testing: System behavior under extreme load conditions
• Endpoint Performance: Individual endpoint response time optimization
• Database Performance: Query optimization and indexing validation

📋 Acceptance Criteria

Must Have

• All 35 KiviCare entities accessible via REST API endpoints
• JWT authentication with role-based access control implemented
• Complete input validation and sanitization for all endpoints
• Comprehensive error handling with proper HTTP status codes
• PHPUnit test suite with 90%+ code coverage
• WordPress coding standards (WPCS) compliance
• API documentation with interactive examples
• Rate limiting and basic security measures implemented

Should Have

• Real-time API monitoring dashboard
• Automated API key management interface
• Comprehensive audit logging system
• Performance optimization with caching
• Multi-language API documentation
• SDK libraries for PHP, JavaScript, Python
• Webhook support for real-time notifications
• Advanced search and filtering capabilities

Could Have

• GraphQL endpoint alongside REST API
• API versioning strategy implementation
• Multi-tenant clinic support
• Advanced analytics and reporting features
• Integration with external healthcare systems (HL7, FHIR)
• Mobile SDK for iOS and Android
• Automated API testing in CI/CD pipeline
• Advanced security features (2FA, IP whitelisting)

🚀 Implementation Plan

Phase 1: Foundation (Weeks 1-2)

• Authentication System: JWT implementation with user role integration
• Core API Framework: Base controller classes and response formatting
• Security Layer: Input sanitization and basic rate limiting
• Testing Foundation: PHPUnit setup and basic test structure

Phase 2: Core Endpoints (Weeks 3-6)

• Patient Management: CRUD operations for patient data and medical history
• Appointment System: Scheduling, modification, and cancellation endpoints
• Doctor Management: Doctor profiles, availability, and specialization data
• Clinic Operations: Multi-clinic support and clinic-specific data access

Phase 3: Advanced Features (Weeks 7-10)

• Clinical Documentation: Encounters, prescriptions, and medical records
• Billing Integration: Bills, services, payments, and insurance claims
• Audit Logging: Comprehensive activity tracking and compliance reporting
• Performance Optimization: Caching, query optimization, and monitoring

Phase 4: Enhancement & Documentation (Weeks 11-12)

• API Documentation: Interactive documentation with Swagger/OpenAPI
• SDK Development: Client libraries for popular programming languages
• Advanced Security: Enhanced rate limiting, API key management
• Production Deployment: CI/CD pipeline and production monitoring

📊 Success Metrics

Key Performance Indicators

• API Response Time: 95th percentile < 200ms
• System Uptime: 99.9% availability
• Test Coverage: 90%+ code coverage maintained
• Security Compliance: Zero critical security vulnerabilities
• Developer Adoption: 10+ active integrations within 6 months

Success Criteria

• Complete API Coverage: All KiviCare entities accessible via REST endpoints
• Production Readiness: Deployed and stable in production environments
• Developer Satisfaction: Positive feedback from integration developers
• Performance Targets: All performance KPIs consistently met
• Compliance Standards: Healthcare data protection requirements satisfied

📚 Documentation Requirements

Technical Documentation

• Complete API Reference with interactive examples (Swagger/OpenAPI)
• Database Schema Documentation with entity relationships
• Architecture Documentation with system diagrams
• Security Documentation including authentication flows
• Deployment Guide for various hosting environments

User Documentation

• Developer Quick Start Guide with sample applications
• API Integration Tutorial with step-by-step examples
• Troubleshooting Guide with common issues and solutions
• Best Practices Guide for optimal API usage
• Migration Guide for existing KiviCare installations

🔄 Dependencies

Internal Dependencies

• KiviCare Plugin: v3.0+ (core healthcare management system)
• WordPress Core: v6.0+ (REST API framework and authentication)
• PHP Runtime: 8.1+ (modern PHP features and performance)

External Dependencies

• Firebase JWT Library: v6.0+ for secure JWT token handling
• PHPUnit Testing Framework: v9.0+ for comprehensive test coverage
• WordPress Coding Standards: Latest version for code quality
• Composer: Package management and PSR-4 autoloading

⚠️ Risks & Mitigation

Technical Risks

• Risk: KiviCare schema changes breaking API compatibility

  • Impact: High - Could break all API integrations
  • Mitigation: Version-controlled API with backward compatibility strategy

• Risk: Performance degradation under high load

  • Impact: Medium - Could affect user experience
  • Mitigation: Comprehensive performance testing and caching implementation

Business Risks

• Risk: Healthcare compliance and data privacy violations

  • Impact: Critical - Legal and regulatory consequences
  • Mitigation: Security-first design with audit logging and compliance review

• Risk: Limited adoption due to complex integration requirements

  • Impact: Medium - Reduces business value and ROI
  • Mitigation: Comprehensive documentation and SDK libraries

📅 Timeline

Milestones

• Foundation Complete: Week 2 - Authentication and core framework ready
• Core API Ready: Week 6 - Primary endpoints functional with testing
• Feature Complete: Week 10 - All endpoints implemented with security
• Production Ready: Week 12 - Documentation, optimization, and deployment

Critical Path

1. Authentication System → Core API Framework → Security Implementation
2. Patient/Appointment Endpoints → Clinical Documentation → Billing Integration
3. Testing Infrastructure → Performance Optimization → Production Deployment

🔗 Related Features

Prerequisites

• KiviCare Plugin Installation: Active and configured
• WordPress Environment: Version 6.0+ with REST API enabled
• SSL Certificate: HTTPS required for secure API communication

Follow-up Features

• Mobile Application: Native iOS and Android apps using the API
• Third-party Integrations: Integration with popular healthcare systems
• Advanced Analytics: Business intelligence dashboard for clinic operations
• Telehealth Integration: Video consultation booking and management

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Specification Version: 1.0
Template Version: Descomplicar® v2.0
Next Phase: Implementation Planning (/plan)