"Costco's Hyatt code (66267) is a Costco member discount, not a Costco employee code. FlyerTalk discussion: "Costco Travel arranges negotiated rates for Costco members — this is a published membership rate, not a confidential corporate employee benefit." Costco members must show membership card at check-in, not an employee badge. The verification risk is minimal: Costco membership is easy to obtain and the card is easy to carry."

"Just call the 1-800 reseversation center and asked for "Oracle" or which ever corp rate you are interested in. Res agents won't give out the code, but they will book under the rate you have asked for and won't ask/challenge your eligibility"

"Many -- possibly even most -- times, a hotel won't ask for proof that you are eligible for a corporate rate. Some hotels claim to check routinely, but that practice is definitely not universal."