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In January 2013 , Weatherhead was sentenced to 18 months in prison for his part in the denial-of-service attacks on PayPal , Visa and Mastercard in December 2010 .
 PayPal
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 PayPal