Bash Script OpenVPN Public IP

This is what I need, currently I have some VPS's using OpenVPN Advanced Server this is the paid version of OpenVPN and also have some VPS's using OpenVPN Source Version ( Free Version ) what I need to acomplish is to be able to asign a specific user a ( Public Static IP ) this Public IP will be provided to me by the Datacenter where the VPS is located, now want to specify I do NOT want a ( Static Internal IP ) the IP I want to assign the user will be ( Public Static IP ) and every single time this user connects to the VPN and goes to the internet if he goes to one of those places ( whats my ip ) he will always be able to see his same Public Static IP assigned. Dont really know what is the process but want this process to be totally automated with a Bash Script so that basically I would run the script and if any directory or conf file needs to be created will be created and assign the ( Pueblic Static IP) to the user I understand that since it will not be always the same IP I may need to enter the IP manually in the Bash Script, this Script needs to work on CentOS. Would be great to have a single Bash Script for OpenVPN AS ( Paid Version ) and OpenVPN ( Source Free version ) if not then 2 Scripts would need to be created one for OpenVPN AS and one for OpenVPN open source free edition. Please be sure to ask any questions you may have and dont pretend to charge an arm or a leg for this as you will only waste your time. Please bid only if you have Bash Script experience, please no time wasters I am looking for a freelancer willing to work. As always if you ahve any questions please feel free to ask.