# [Consumer APIs Overview](overview.md)
# [Purpose Strings](purpose-strings.md)
# [Purpose hierarchy and multi-tenancy](purpose-strings-multitenancy.md)
# [Password Hashing](password-hashing.md)
# [Limiting the lifetime of protected payloads](limited-lifetime-payloads.md)
# [Unprotecting payloads whose keys have been revoked](dangerous-unprotect.md)