Connecting my WordPress store with an external billing system

详细信息

I am looking for a professional php programmer to connect an external billing system with my wordpress store.The external API ishttps://aliphia.com/api-docs/I just want to link product quantities so that if I add a quantity in the invoicing program, the number increases automatically in my wordpress store, and if the purchase is made from my wordpress store, the number decreases in the external billing system.