Set Email Prefs Handler

Request

• Base URL
  https://api.lmnt.com (the document declares no server; this is the origin it was published from)
• Auth
  none declared
• TypeScript
  https://skmtc.dev/lmnt/apis/yapster/docs/v1/account/set_email_prefs/post.ts

  A function with typed inputs. Its response is checked against the schema.