I have been using OpenSRS for a decade or so and loved them until I started trying to use WHMCS 3 years ago (which still is not set up or functioning properly). Anyhow, I tried hiring a WHMCS developer to help me fix some other problems and he recommended looking into Rad Web Hosting as a more up-to-date registrar and one that was local. Anyhow, I only have a dozen or so clients on WHMCS, but if I transition from OpenSRS to Rad Web Hosting how do I transfer all my clients' domain names without them incurring a transfer fee (I will be paying this or have it included in their renewal fee)?
I assume I can or should only run one Registrar app at a time. Is this correct?
If I shut down the OpenSRS Pro app, will my clients still be able to access their domains?
I am not a high-level developer nor a WHMCS expert so any help would be appreciated to understand how to make this transition between registrars with no disruption or expense to the client. Thank you!