1) Customisation of WooCommerce plugins including: points & rewards, membership, subscription, social login, stripe plugins.
2) Build secure authentication mechanism to auth against WordPress customers ( users ) username / password from the web store across to a 3rd party mobile app. This mechanism needs to be able to receive request from within the web store as well as 3rd party application. Needs to store secure login token on users devices to have users stay logged in.
3) Server security configurations, SSL certificate.