I have 1 camera and want to add another camera to my account.
Another person will be logging in with an account they will have but I will be paying.
How to do so?
Here are some instructions. Maybe it would be easier to call Wyze support.
How do I create a Wyze account?
https://support.wyze.com/hc/en-us/articles/360032064392-How-do-I-create-a-Wyze-account
The only option is to share the camera with the other individuals. However, they will not have full functionality as a shared user.
-OR-
You add the camera to their account and they share it with you If needed.
What are you paying for? Cam Plus, Cam Unlimited, Cam Unlimited Pro? Or just the camera
Cam Plus
How about adding the new camera to your account and give your User Name and Password to the other person. That is what I do for my wife and I ask my wife to please do not change settings.
That is a definite way of doing it. However, the assumption is that they are ok with sharing all devices with whomever.
I do the same with my wife as well.
I called Wyze support. They explained that my relative can add an account and use my credit card. They would have the same settings as me but a separate log in account. At the website you can change the credit card number as well so have two cards.
I think there is some confusion. A camera can only be connected to one Wyze account and/or subscription. If they create a new account and subscribe to cam plus, they will “own” that camera (doesn’t matter what credit card is used). They will then have to share it with you and you’ll be a restricted guest of that camera. They will not inherit any of your settings or anything like that.
There are 2 cameras but 1 credit card… 
Now there are 2 accounts after my relative set up their account today.
Credit card has nothing to do with anything, you can have 1 or 100. Like I said, with two accounts, you each are now “owners” of one cam. If you want to see the other cam they will have to invite you as a shared user, which is highly restricted access. If that is the model you want, then you’re all set. But from your original post it sounded like you wanted both cams on one account.
Not at all. I have 1 account and my relative another and 2 cameras and I am using the same credit card. I set it up with wyze support. They are separate accounts.
I don’t know why you keep saying same credit card. That has nothing to do with anything.
A camera can be linked to only one account.
So your account has one cam, your relative’s account has another cam. If you don’t care to see each other’s cams, you’re all set. Wyze doesn’t care who pays for it, as long as it is paid.
It was not clear from your original post what you were asking. If your intent was to set up 2 accounts with the same payment method, yes that can be done and sounds like you’ve done it.
If your intent is to have access to both cams, that’s a different story.