Thanks for the reply, I have seen this, but from one IP there is a restriction that " 10 Accounts per IP Address per 3 hours.".
How to getride of this limit for my situlation, is there any way?
It depends on you....
Normally, you would be able to use the same account for all domains on this server. (Or you could do domain per account, depends on your hosting software)
Beside a "Apache server", are you using any control panels for this? (Like cPanel, Plesk?)
In our integration guide we recommend hosting providers use one shared ACME account for issuing certificates instead of one account per certificate/client.
Most ACME clients register an account the first time you run them, and then reuse it afterwards. If you use a typical client, and follow its documentation, it won't be a problem.
Issuing 1000 certificates may take you 10 hours, though.
For users of the ACME v2 API you can create a maximum of 300 New Orders per account per 3 hours.
You should read the links posted before, as well as: