The document discusses best practices for securing APIs and identifies three key areas: parameterization, identity, and cryptography. It notes that APIs have a larger attack surface than traditional web apps due to more direct parameterization. It recommends rigorous input and output validation, schema validation, and constraining HTTP methods and URIs. For identity, it advises using real security tokens like OAuth instead of API keys alone. It also stresses the importance of proper cryptography, like using SSL everywhere and following best practices for key management and PKI. The overall message is that APIs require different security practices than traditional web apps.