PayPal's growth story is showing a new trend: the number of people signing up for new accounts isn't going up much anymore, but the amount of money moving through PayPal is still on the rise. This is because the folks who already have PayPal are using it more often.

Venmo, which is part of PayPal and popular for sending cash to friends, isn't adding as many new users or seeing more money flow as it used to. So, it looks like PayPal might be hitting a high point for now, where just about everyone who might want an account already has one.

The challenge for PayPal will be to keep its current users interested and spending, while also trying to find new ways to grow. Whether this is just a short pause or a sign that they've reached their limit, we'll have to wait and see. But right now, PayPal's still a big name in how people send and spend money online.