Oh, sorry, I didn't fully answer you quesstion. Yes, you'll have to give them the e-mail you used to make this account for them to keep score of your points. Sorry for the confusion!
If you signed up with the email, (the same one online and in the store) then if you buy things online or in the store, the points will be all added. so there shouldn't be any confusion to having separate points! Hope my answer helped! Have fun!