// Needed by TLTransactionManager instance for interacting with web service
HCRelationExecutor *relExec =
  [[HCRelationExecutor alloc] initWithDefaultAcceptCharset:[HCCharset UTF8]
                                     defaultAcceptLanguage:@"en-US"
                                 defaultContentTypeCharset:[HCCharset UTF8]
                                  allowInvalidCertificates:NO];

NSFileManager *fileMgr = [NSFileManager defaultManager];
// URL of local folder to contain SQLite data file
NSURL *sqliteDataFileFolderUrl = [fileMgr URLForDirectory:NSLibraryDirectory
                                                 inDomain:NSUserDomainMask
                                        appropriateForURL:nil
                                                   create:YES
                                                    error:nil];
// URL of SQLite data file
NSURL *sqliteDataFileUrl =
  [sqliteDataFileFolderUrl URLByAppendingPathComponent:@"peapptxns.data"];

// Finally we create the transaction manager instance
TLTransactionManager *txnMgr =
  [[TLTransactionManager alloc] initWithDataFilePath:[sqliteDataFileUrl absoluteString]
                                 userAgentDeviceMake:[PEUtils deviceMake] // from PEObjc-Commons
                                   userAgentDeviceOS:[[UIDevice currentDevice] systemName]
                            userAgentDeviceOSVersion:[[UIDevice currentDevice] systemVersion]
                                    relationExecutor:relExec
                                          authScheme:@"auth-scheme"
                                  authTokenParamName:@"auth-token"
                                  contentTypeCharset:[HCCharset UTF8]
                                  apptxnResMtVersion:@"1.0.0"
                                               error:nil]; // provide non-nil err handler in 'real' code

// Set the URI of the remote 'transactions' REST resource.  How you get this
// is dependent on your application.
NSURL *txnStoreResourceUri = ...;
[txnMgr setTxnStoreResourceUri:txnStoreResourceUri];

// Authentication token used when invoking web service layer (application
// dependent)
NSString *authToken = ...;
[txnMgr setAuthToken:authToken];

// Define use case values
typedef NS_ENUM(NSInteger, PEAppTxnUsecase) {
  PEAppTxnLogin,
  PEAppTxnCreateAccount,
  ...
};

// Define use case event values
typedef NS_ENUM(NSInteger, PETxnLoginUsecaseEvent) {
  PETxnLoginEvtInitiated,
  PETxnLoginEvtCanceled,
  PETxnLoginEvtRemoteCommReqInitiated,
  PETxnLoginEvtRemoteProcStarted,        // recorded server-side
  PETxnLoginEvtRemoteProcDoneErrOccured, // recorded server-side
  PETxnLoginEvtRemoteProcDoneInvalid,    // recorded server-side
  PETxnLoginEvtRemoteProcDoneSuccess,    // recorded server-side
  PETxnLoginEvtRemoteCommRespReceived
};

...

// error handling block
TLDaoErrorBlk errorBlk = ^(NSError *err, int errCode, NSString *errDesc) {
  NSLog(@"Error attempting to persist txn log to local SQLite store: %@", err);
};

// Creating the transaction instance for our 'logging in' use case
TLTransaction *loggingInTxn = [_txnMgr transactionWithUsecase:@(PEAppTxnLogin)];

// Log the fact the user has initiated the act of logging in.
[loggingInTxn logWithUsecaseEvent:@(PETxnLoginEvtInitiated) error:errorBlk];

// Log the fact the user has canceled logging in
[loggingInTxn logWithUsecaseEvent:@(PETxnLoginEvtCanceled) error:errorBlk];

// Log the fact that your app initiated the web service call to log in the user
[loggingInTxn logWithUsecaseEvent:@(PETxnLoginEvtRemoteCommReqInitiated) error:errorBlk];

// Log the fact that the 'log in' web service response was received.
[loggingInTxn logWithUsecaseEvent:@(PETxnLoginEvtRemoteCommRespReceived) error:errorBlk];