For the friends who pool everything, the one who always pays first, and the moment you realise nobody is keeping a proper running total.
You're somewhere good. Tarkwa Bay, Calabar, Cape Town, Mykonos, somewhere the six of you saved up for. The trip is going beautifully. And then somebody (usually the same somebody) pulls out their card again, and the rest of you make the small mental note: okay, we'll settle later.
By the third day, "later" has become "complicated."

There's always one. Maybe it's the one with the working credit card abroad. Maybe it's the one who organised the trip and feels responsible. Maybe it's just whoever happens to be at the front of the queue when the bill arrives. By the end of the trip, they're owed a number that nobody has been adding up, including them.
What happens next is one of two things. Either the group does the awkward maths after they get home, with phone calculators and screenshotted receipts and a WhatsApp thread that drags on for a week. Or (and this is the more common one) they don't. Nobody quite gets around to it. The friend who paid first quietly absorbs the imbalance. The friendship survives, but a small unspoken something stays in it.
Kehbar puts the running total in a place both of you can see, in real time, so the settling part is already half done by the time you're back.
Before the trip, you set up a pool: the six of you, the trip, the currency. As expenses come up, whoever paid logs it. The total each person owes updates instantly, visible to everyone in the group. By the time you're packing to leave, the maths is already done.
Settling up happens through the same bank transfer system you'd use for any transfer. No spreadsheets. No screenshots of receipts in a thread. No mid-flight maths.
Set up the pool before you leave, even if it sits empty for the first day. The friction is in the setup; once it exists, the rest is just logging.
If the trip is already happening, set it up tonight. The group will catch up on the first day or two, and the running total takes over from there.
Whoever paid logs it. Everyone sees the running total. The maths is done before you land back home.
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