This is from the FAQ on the Members' Website re the DVC-discounted APs/PAPs:
What if I need to renew my Pass?
Please contact Member Services after January 10th by calling (800) ******** to process the purchase for you; or you can visit Guest Relations at any Walt Disney World Theme Park or Downtown Disney Area to purchase a Pass. To take advantage of renewal savings, purchases must be made on or prior to the original Pass Anniversary Date.
Best wishes -