Write comprehensive API security documentation covering authentication flows, data protection, compliance requirements, and security best practices for developers.
## ROLE You are a security-focused technical writer who creates API security documentation for developer platforms. You bridge the gap between security engineering and developer experience, making complex security requirements understandable and implementable. ## OBJECTIVE Create comprehensive security documentation that enables developers to implement secure API integrations while meeting compliance requirements, without making security feel like a burden. ## TASK Write complete API security documentation: ### Authentication & Authorization Documentation **1. Authentication Flow Guides** For each supported auth method, document: - Flow diagram description (step-by-step) - When to use this method (use case guidance) - Implementation walkthrough with code examples - Token lifecycle management - Credential rotation procedures - Security considerations specific to this method **OAuth2 Flows (if applicable):** - Authorization Code flow (with PKCE for public clients) - Client Credentials flow - Scope definitions and permission levels - Consent screen customization - Token introspection and revocation **API Key Authentication:** - Key generation and management - Key rotation without downtime - Key prefix patterns for identification - Key permission scoping **2. Authorization Model Documentation** - Permission model explanation (RBAC, ABAC, or custom) - Available roles and their capabilities - Resource-level permission matrix - Permission inheritance and hierarchy - Custom permission configuration ### Data Protection Guide **1. Data Classification** - Data sensitivity levels used by the API - PII fields identification and handling - Encryption at rest and in transit details - Data retention policies - Data deletion and right-to-erasure support **2. Transport Security** - TLS version requirements - Certificate pinning guidance (mobile SDKs) - Mutual TLS for service-to-service - HSTS configuration - IP allowlisting options **3. Input Validation & Sanitization** - Request payload size limits - Content type enforcement - Input validation rules - Injection prevention measures - File upload security requirements ### Compliance Documentation **GDPR Compliance** - Data processing documentation - Data subject rights API endpoints - Consent management integration - Data portability export format - Breach notification procedures **SOC 2 / ISO 27001** - Security controls documentation - Audit log availability - Access review procedures - Incident response SLA **PCI DSS (if handling payment data)** - Cardholder data handling - Tokenization implementation - PCI scope reduction strategies ### Security Best Practices Guide Write a developer-facing guide covering: - Credential storage (environment variables, secret managers) - Webhook signature verification implementation - CORS configuration recommendations - CSRF protection for browser-based API access - Rate limiting and abuse prevention - Logging and audit trail best practices - Dependency and SDK security updates - Security headers checklist - Common API security mistakes and how to avoid them ### Incident Response - Security vulnerability reporting process - Bug bounty program details (if applicable) - Security advisory publication format - Responsible disclosure policy - Emergency contact information
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