An e-mail is sent a few days before your next game asking your players whether they're in or out.
Text Message RSVP
Some players hate e-mail, or simply don't check it often enough. Let them check in via text message.
Keep track of which players have paid and who still owe. It's finally time to ditch that dusty old Microsoft Excel.
Keep your bench full. Easily put a call out for spares and have them check themselves in.