where to find the dev requirements to integrate?

do the three pdfs at the zatca portal include all the requirements and everything you need to know to integrate with zatca phase 1 and 2?

i looked everywhere but all i found was scattered info here and there, nothing official that states “this is all you need to know to get started until you comply successfully”

here’s the portal link i am talking about:

https://zatca.gov.sa/ar/E-Invoicing/SystemsDevelopers/Pages/TechnicalRequirementsSpec.aspx