Consistent login across sites

PJK

Active member
I run a puzzle community on XF 2. We have threads where people run competitions where members time their solves and post their times.

A couple years ago, one of the members decided to build out a separate competition site which enabled people to create an account and post their times. It has a few nice features like automatically ranking people, historical times, etc.

I want to have a XF dev do 2 things:
1) to allow all members of the community to login to the competition website using their XF login
2) Around 2,000 members have registered on the competition site already. I'd want to merge their accounts.

What is the process to get this done, how long will it take, and approx. how much will it cost? The user experience would be much better with a single login.

Thanks.
 
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