API developer for Woocommerce Integration

Hello, I need an API expert to develop a Woocommerce integration. What i need to integrate this invoice software [login to view URL] "Fatture in Cloud" with woocommerce. Actually i build a plugin but not works very well. This plugin generate an invoice on "Fatture in Cloud" when the order is complete with client information and payment method. Also, it can send manually an email to the client using api. I need to implement two feature: - send the invoice automatically to the client - set the tax and type of document generated.