HIPAA-Compliant Patient Data Anonymization API Middleware

Design a Laravel middleware that automatically de-identifies patient health records before API transmission, ensuring HIPAA compliance. The middleware must strip Personal Health Information (PHI) by replacing names with hashed identifiers, removing precise geographical data, and implementing selective field masking. Create a robust configuration that allows granular control over which fields are anonymized, with built-in logging for compliance auditing. Include methods to handle different data structures from EHR systems and provide clear error handling for fields that cannot be anonymized.