ManualCPCAdGroupBids adGroupBids = new ManualCPCAdGroupBids();
adGroupBids.setKeywordMaxCpc(new Bid(new Money(null, 10000000L)));
adGroup.setBids(adGroupBids);
// Create operations.
AdGroupOperation operation = new AdGroupOperation();
operation.setOperand(adGroup);
operation.setOperator(Operator.ADD);
AdGroupOperation[] operations = new AdGroupOperation[] {operation};
// Add ad group and return AdGroup ID.
return adGroupService.mutate(operations).getValue()[0].getId();