What is the relationship between MasterCard and purchase in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

“Accepted in over 210 countries, wherever MasterCard is accepted, the credit cards are by far the fastest way to earn Miles with a ticket purchase to fly on SAA or make qualified merchant purchases,” said Samuel Ashitey Adjei, MD of Ecobank Ghana.

Answer: headquarters_location