Is it against company's rule if a customer at a convention offers a $25 gift to William for being so helpful?

No-it is also considered a conflict of interest to accept a gift, entertainment, or other benefit of more than $50 value from a supplier to or customer of the webbed sphere inc. you may accept meals and refreshments if they are infrequent, are of nominal value, and are in connection with business discussions. you should inform anyone doing or desiring to do business with webbed sphere inc. that all gifts other than advertising novelties are discouraged. if you do receive something or a benefit of more than nominal value, you should report it promptly. it will be turned over to the webbed sphere inc. to be returned or donated to charity.