Puts the given credentials under auth_type into the existing request map

Args

• request - the map used to store the credentials, usually created via Ivar.new/2
• credentials - the credentials to be used for authentication
• auth_type - an atom for the type of authentication to be used (:basic or :bearer)

Credentials

• :basic auth tuple - {"username", "password"}
• :bearer token - "some.token"

Usage

iex> Ivar.Auth.put(%{}, {"user", "pass"}, :basic)
%{auth: {"authorization", "Basic dXNlcjpwYXNz"}}