Just found this on the Disney World site. ~

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Payment Procedures
A DEPOSIT of $200 per reservation plus the price of any promotional or published airfares must be received at time of booking or the reservation will be automatically canceled.
FINAL PAYMENT is due in our office 45 days prior to guest arrival. Bookings made 45 days or less prior to arrival must be paid in full at time of booking.
FINAL PAYMENT can be made online with a valid credit card or can be sent to Walt Disney Travel Co., Inc., P.O. Box 10375, Lake Buena Vista, FL 32830. For overnight delivery via private courier service only, send to: Walt Disney Travel Co., Inc., 7100 Municipal Drive, Orlando, FL 32819. Please note: regular U.S. mail service does not deliver to the Municipal Drive address. Vouchers are proof of final payment.
Cancellation and Change fees
For cancellations or changes, if your air travel has been ticketed, there will be a cancellation or change fee per ticket equal to the higher of (i) $100 and (ii) the cancellation or change fee assessed by the airline. Please note that cancellation of a nonrefundable, published or promotional airfare results in a charge equal to the entire amount of the airfare. In addition:
For a cancellation made 6 to 44 days prior to arrival, there is an additional cancellation fee of $100 per package plus any cancellation fees assessed by hotels or other suppliers.
For a cancellation made 5 days or less prior to arrival, there is an additional cancellation fee of $200 per package plus any cancellation fees by hotels or other suppliers. No refunds will be given to no-shows.
For a change made 44 days or less prior to arrival or that results in a rate change, there is an additional change fee of $50 per package plus any change fees assessed by hotels or other suppliers.
For changes, the change fees must be paid in addition to any increase in rate resulting from the change.
Travel insurance is nonrefundable
Change Procedure
Changes affecting outbound flights or first night's accommodations must be made at least 6 business days prior to arrival. All existing documents must be returned to Walt Disney Travel Co., Inc. via overnight delivery service and revised documents will be delivered express at an additional cost of $10.
Land portions of the booking cannot be cancelled without canceling the air reservations.