Many of our families and couples travel with other families and friends.  We often use multiple credit cards to pay for various trip elements such as hotels, transfers, tours, entries, and more.  A great way to sort out who has paid for what and who owes who what is with the Splitwise app. Organize all of your trip expenses (in a variety of currencies) and the app can figure out who owes what based on how you decide to divide up the total.  This app is free although there’s a pro version for $2.99 a month or $29.99 a year that lets you track spending by category, scan receipts that can be itemized, and more.  In the US, the app also allows you to pay an establishment via PayPal or Venmo.  It is available for iPhone and Android and can be used offline as well.