Mastercard - A global technology company in the payments industry
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Mastercard - Wikipedia
Mastercard Inc. (stylized as MasterCard from 1979 to 2016 and as mastercard since 2016) is an American multinational payment card services corporation headquartered in Purchase, New York. [5]

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Citi ThankYou® Mastercard® - Log In or Apply
1-800-669-8488 24x7 Additional Phone Numbers Technical Assistance 1-800-815-7701 For TTY: Use 711 or other Relay Service Outside the U.S., Canada and Puerto Rico, Phone Number 1-208-822-0001 Citi ThankYou® Mastercard® General Inquiries PO Box 6275 Sioux Falls, SD 57117 Payment Addresses

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