Sorry, I've been meaning to post this since last March.
I know this is for domestic flights wanting to check baggage at the Disney resorts. If your air carrier charges for a checked bag, then you MUST pay for the fee before you can drop it off with the baggage people at Disney.
The number is 407.284.1231 You will then be directed to the your air carrier and you can pay the fee with a credit card. You must then give the confirmation number to Disney.