Inquiry regarding the initial steps of the communication process

[ashraf_gebril]

Dear @idaoud Thank you very much.

Unfortunately, I do not understand the speech without an illustrative example, especially since there are no examples on the site for the PHP language. But thanks be to God, I am almost there.

As for your response regarding my concerns about the repetition process, I will post a picture of what I created in recording the basic data and saving it.

I use this data with every invoice creation

This is the result I currently have with every automatic invoice creation.

Please answer me this question here

Inquiry about a certificate for each user

Does each branch have a certificate and does any user who creates invoices use that certificate? Or does it mean that each device has a certificate? Is it normal for each device to have a certificate? Let’s say, for example, that I have 50 devices that create invoices in one branch, is this normal? The issue, for me as a programmer, is it easy to play with in order to bypass something like that unless each company provides the number of users it has. I can register my invoices on the system …