framework/ember/app/authorizers/flarum.js

import Base from 'simple-auth/authorizers/base';

export default Base.extend({
  authorize: function(jqXHR, requestOptions) {
    var token = this.get('session.token');
    if (this.get('session.isAuthenticated') && !Ember.isEmpty(token)) {
      jqXHR.setRequestHeader('Authorization', 'Token ' + token);
    }
  }
});