purchase-contract.effects.ts

 createProduct$ = createEffect(
    () =>
      this.actions$.pipe(
        ofType(PurchaseContractActions.createPurchaseContract),
        map(action => action.payload),
        exhaustMap((payload) => {

          return this.fleaSrv.createPurchaseContract(payload).pipe(
            tap(address => console.log('Contract address: ', address)),
            switchMap((address: string) => {

              return [
                PurchaseContractActions.createPurchaseContractSuccess({
                  product: {
                    productKey: payload.productKey,
                    contractAddress: address
                  }
                }),
                // update ballance
                Web3ProviderActions.getBalance()]
            }),

            catchError((err: Error) =>
              of(ErrorActions.errorMessage({ errorMsg: err.message }), SpinnerActions.hide(),
                // update ballance
                Web3ProviderActions.getBalance())
            )
          )
        })

      ));