I didn't work with Sage products
one of our clients want to make automatically integration between our PHP Application with Sage 300 (products and invoices)
they are doing integration manually, they are inserting data twice
i'm searching for Web services API documentatin to do the integration

i know that in 2017 realease there are many restful API
but i didn't find any documentation for it

i found this file
cdn.na.sage.com/.../Sage300_WebAPI_EndpointReference.pdf
but i don't understand anything

any help will be appreciated ?