We use the free Lyft credit that she gets from T-Mobile, but it's my credit card on the account. True sharing right there! Luckily she doesn't abuse the situation by chauffeuring herself around town on my card. It actually works out pretty well because at least she'll know if I ever get into a sticky Lyft situation and vice versa-- saves me the time from texting her. I used to screenshot all the driver/car info and send it to her when taking a Lyft from my local T station back to my house because who knows who might be prowling around these little suburbs at night!!! (Just kidding, no one is prowling.)