Module development (web service) Siberian CMS with link to Adempiere 3.6.0LTS

We want to create a Siberian CMS module that can contact an Adempiere web service by passing login data to verify the existence of the customer on the System. If the customer is registered he must be able to access a reserved area on a dedicated portal (Liferay). Furthermore, the Siberian CMS module must be able to receive data from Adempiere and communicate it to the end customer via push notification.