in common/js/mock/fbinstant.6.2.mock.js [283:298]
getSupportedAPIs: function () {
var supportedAPIs = [];
for (var prop in FBInstant) {
supportedAPIs.push(prop);
}
for (var playerProp in FBInstant.player) {
supportedAPIs.push('player.' + playerProp);
}
for (var contextProp in FBInstant.context) {
supportedAPIs.push('context.' + contextProp);
}
for (var paymentsProp in FBInstant.payments) {
supportedAPIs.push('payments.' + paymentsProp);
}
return supportedAPIs;
},