In order to play in the GPSD, you need to obtain a player card from OASA (Oregon Adult Soccer Association).
You can do so online at the following address: www.oregonadultsoccer.com
You must be 18+ to obtain a card.
OASA is located at the following address:
1750 SW Skyline Blvd #121, Portland, OR 97221
You can call them at: 503-292-1814