@Tut The General Authority of Zakat and Tax (GAZT) is pleased to be implementing electronic invoicing (e-invoicing),it aims to specify the business and technical requirements to be mandated toward e-invoicing.
Kindly find the link for the technical specifications: الهيئة العامة للزكاة والدخل
we hope it will take in consideration in the near future ,since we are using manager for our business.