diff --git a/mnz-client/cmd/mnz-client/root.go b/mnz-client/cmd/mnz-client/root.go
index b3df384..9cf78b8 100644
--- a/mnz-client/cmd/mnz-client/root.go
+++ b/mnz-client/cmd/mnz-client/root.go
@@ -3,7 +3,6 @@
 package main
 
 import (
-	"encoding/json"
 	"flag"
 	"fmt"
 	"log"
@@ -12,6 +11,14 @@ import (
 	"github.com/milaboratory/small-binaries/mnz-client/internal/mnz"
 )
 
+const (
+	// fakeProductKey is needed for tests of our workflow.
+	fakeProductKey = "MIFAKEMIFAKEMIFAKE"
+
+	// fakeResponseToken is a response for fakeProductKey, it contains a number of remaining runs.
+	fakeResponseToken = "eyJhbGciOiJFUzI1NiIsImtpZCI6Im1pMiJ9.eyJtbnoiOnsiZGV0YWlscyI6eyJyZW1haW5pbmciOiA5OTk5OTJ9LCJ0eXBlIjoiYmFzZSJ9LCJwcm9kdWN0S2V5IjoiTUlGQUtFTUlGQUtFTUlGQUtFIiwicnVuU3BlYyI6eyJrZXkiOiJ2YWx1ZSJ9fQ==.K7pU8XE476enl-wI-rnHXnvCGLGfM0mdDS0HPdIXhnE5tuc1nKcSZMMTZSZ6USSc1_syHhDkrjsm7UvZTcQwqg"
+)
+
 func main() {
 	// define flags
 	flag.Usage = func() {
@@ -76,6 +83,11 @@ func main() {
 		log.Fatal(err)
 	}
 
+	if *productKey == fakeProductKey {
+		fmt.Println(fakeResponseToken)
+		return
+	}
+
 	// call
 	req := mnz.RunSpecRequest{
 		License:    license,
@@ -90,10 +102,5 @@ func main() {
 		log.Fatal(err)
 	}
 
-	bytes, err := json.Marshal(result)
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	fmt.Println(string(bytes))
+	fmt.Println(result)
 }
diff --git a/mnz-client/internal/mnz/mnz.go b/mnz-client/internal/mnz/mnz.go
index f0f9691..2d9c615 100644
--- a/mnz-client/internal/mnz/mnz.go
+++ b/mnz-client/internal/mnz/mnz.go
@@ -44,8 +44,7 @@ type RunSpecRequest struct {
 	RunSpec    map[string]Arg `json:"runSpec"`
 }
 type RunSpecResResult struct {
-	JwtToken       string  `json:"jwtToken"`
-	NRemainingRuns *uint64 `json:"nRemainingRuns,omitempty"`
+	JwtToken string `json:"jwtToken"`
 }
 type RunSpecResError struct {
 	Code    string `json:"code"`
@@ -117,11 +116,11 @@ func CallRunSpec(
 	retryWaitMin int,
 	retryWaitMax int,
 	retryMax int,
-) (*RunSpecResResult, error) {
+) (string, error) {
 	// Serialize the request to JSON
 	data, err := json.Marshal(runSpecRequest)
 	if err != nil {
-		return nil, fmt.Errorf("failed to serialize request: %w", err)
+		return "", fmt.Errorf("failed to serialize request: %w", err)
 	}
 
 	// Create a retryable HTTP client
@@ -134,7 +133,7 @@ func CallRunSpec(
 	// Create the POST request
 	req, err := retryablehttp.NewRequest("POST", url, bytes.NewBuffer(data))
 	if err != nil {
-		return nil, fmt.Errorf("failed to create request: %w", err)
+		return "", fmt.Errorf("failed to create request: %w", err)
 	}
 	req.Header.Set("Content-Type", "application/json")
 	req.Header.Set("User-Agent", "mnz-client")
@@ -142,27 +141,27 @@ func CallRunSpec(
 	// Perform the request
 	resp, err := client.Do(req)
 	if err != nil {
-		return nil, fmt.Errorf("request failed: %w", err)
+		return "", fmt.Errorf("request failed: %w", err)
 	}
 	defer resp.Body.Close()
 
 	// Check for non-200 HTTP status
 	if resp.StatusCode != 200 {
-		return nil, fmt.Errorf("received non-200 response: %d", resp.StatusCode)
+		return "", fmt.Errorf("received non-200 response: %d", resp.StatusCode)
 	}
 
 	// Parse the response
 	body, err := io.ReadAll(resp.Body)
 	if err != nil {
-		return nil, fmt.Errorf("failed to read response: %w", err)
+		return "", fmt.Errorf("failed to read response: %w", err)
 	}
 
 	result, err := unmarshal(body)
 	if err != nil {
-		return nil, err
+		return "", err
 	}
 
-	return result, nil
+	return result.JwtToken, nil
 }
 
 func unmarshal(body []byte) (*RunSpecResResult, error) {