I try to build an extension related to paytm and i have downloaded its jar file and added it at :- C:\Users\Utkarsh\appinventor-sources\appinventor\build\components\deps
and now try to import
import com.paytm.pgsdk.PaytmOrder;
import com.paytm.pgsdk.PaytmPGService;
import com.paytm.pgsdk.PaytmPaymentTransactionCallback;