Refer to the input text as context and select the correct relationship between 'MasterCard' and 'purchase' from the available options.
Options: operator, founded by, headquarters location, member of

Samuel Ashitey said the MasterCard network in over 220 million shops and businesses in over 210 countries, the SAA Voyager credit card is by far the fastest way to earn miles with a ticket purchase to fly on South Africa Airways or make qualified merchant purchase.
headquarters location