Request money online for the entrance fee for a softball league

There's a softball league that's going to hold games at the local field and you have enough friends and neighbors to field a team. The league has a small entrance fee and asks that teams wear similar t-shirts for differentiation. So you need to collect money for both things from a group of people who all have different schedules and different levels of interest in the paying aspect of this softball thing. You need a way to make it easy and convenient for everyone so you're not stuck fronting the entrance fee and t-shirt costs.