For cross-platform security architecture, you should provide the following documentation:
1. **Architecture Diagrams**: Include data touch points, information flows, authentication, authorizations, and other security controls.
2. **Services and Artifacts**: List all components like web and mobile solutions, web services, APIs, and SDKs.
3. **Third-Party Libraries**: Provide an inventory of all third-party libraries and their versions, including vulnerability assessments.
4. **Security-Assurance Activities**: Document your SDLC methodology, vulnerability management, remediation SLAs, supplier security programs, and security-awareness training.
5. **Sensitive Data Inventory**: List sensitive data processed or stored, such as payment, personal, or health data.
6. **Data Storage Details**: Disclose storage locations and providers (e.g., AWS, Azure, GCP).
7. **Third-Party Suppliers**: List suppliers with whom customer data is shared.
8. **Certifications**: Include reports like HIPAA, PCI DSS, SOC 2, or ISO27001.
9. **Support and Incident Reporting**: Provide contact information for support and security incident reporting.
Additionally, include security scan reports, explanations for false positives, and detailed user documentation for your solution.