If it is Playa de Oro or Playa Bonita or The Reef, they all have USA bank accounts. Simply wire the funds to their account and print the transaction receipt out. Email them a copy of the payment and record their response. It's pretty easy and cost almost nothing to do.
We are locals and we use a combination of Pesos, Dollars and Debit cards for everything. It works the same for you too. Bring dollars with you to pay for things you may have done on your rig while here, go to the ATM here either at the bank or at the supermarket for your pesos. If you haven't done so inform your debit-credit card provider that you will be in Mexico so you do not have issues while here. Plus be sure that you card is a smart card as Mexico changed to this technology years ago and the USA is late to the date and some issuers still have the swipe only cards which we have difficulty with here.
I hope this is helpful.
Russ Black
011-521-638-113-4591 Cell Phone
Puerto Penasco, Sonora