Chatwoot/app/controllers/api/v1/accounts/contacts/contact_inboxes_controller.rb

class Api::V1::Accounts::Contacts::ContactInboxesController < Api::V1::Accounts::Contacts::BaseController
  before_action :ensure_inbox, only: [:create]

  def create
    source_id = params[:source_id] || SecureRandom.uuid
    @contact_inbox = ContactInbox.create!(contact: @contact, inbox: @inbox, source_id: source_id)
  end

  private

  def ensure_inbox
    @inbox = Current.account.inboxes.find(params[:inbox_id])
    authorize @inbox, :show?
  end
end