lipsis> 3. Authorization </span> </a> <nav class=md-nav aria-label="3. Authorization"> <ul class=md-nav__list> <li class=md-nav__item> <a href=#31-scope-based-authorization class=md-nav__link> <span class=md-ellipsis> 3.1 Scope-Based Authorization </span> </a> </li> <li class=md-nav__item> <a href=#32-rate-limiting class=md-nav__link> <span class=md-ellipsis> 3.2 Rate Limiting </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=#4-encryption class=md-nav__link> <span class=md-ellipsis> 4. 