function checkMasterCard() {  // eslint-disable-line no-unused-vars
  canMakePaymentHelper([{
    supportedMethods: 'mastercard',
  }]);
}
/**
 * Merchant checks for ability to pay using "mastercard".
 */
Merchant checks for ability to pay using "mastercard".
Merchant checks for ability to pay using " mastercard " .
function checkMasterCard() {  
  canMakePaymentHelper([{
    supportedMethods: 'mastercard',
  }]);
}
function checkMasterCard ( ) { canMakePaymentHelper ( [ { supportedMethods : 'mastercard' , } ] ) ; }
Merchant checks for ability to pay using "mastercard".
Merchant checks for ability to pay using " mastercard " .
// eslint-disable-line no-unused-vars