---
parser: v2
time: 15
auto_validation: true
tags: [ tutorial>beginner, topic>cloud, software-product>technology-platform>sap-business-technology-platform, tutorial>license]
primary_tag: software-product>sap-event-mesh
slug: cp-enterprisemessaging-test-queue-sendreceive
canonical_url: https://developers.sap.com/tutorials/cp-enterprisemessaging-test-queue-sendreceive
---

# Send and Receive Test SAP Event Mesh
<!-- description --> Test send and receive of message with REST protocol using the Postman tool for a SAP Event Mesh instance.   

## Prerequisites
  - [Postman](https://www.getpostman.com/), API Development environment Tool is available to publish & receive message from queue using REST Protocol


## You will learn
  - Send and Receive message to and from a queue using Postman, a REST-based tool
  - **IMPORTANT:** It is really important to understand the concept of Service Key of an SAP Event Mesh instance. Check out **Step 2** of [Create Instance of SAP Event Mesh Service](cp-enterprisemessaging-instance-create).

---

### Configure postman


1. Open the Postman.

2. Click on "New" to open a new tab on Postman to work on.

    ![new tab](https://raw.githubusercontent.com/sap-tutorials/Tutorials/master/tutorials/cp-enterprisemessaging-test-queue-sendreceive/postman-new-tab.PNG)

3. Fetch the OAuth2.0 access token to be used for authorization on all subsequent operations in same session

    ![service keys for rest protocol](https://raw.githubusercontent.com/sap-tutorials/Tutorials/master/tutorials/cp-enterprisemessaging-test-queue-sendreceive/service-keys-rest.PNG)

4. Provide the **token endpoint URL** in Postman URL from the **Service Keys** for the protocol type HTTPREST.

    Build the postman URL by appending the `GRANTTYPE` as **CLIENTCREDENTIALS** and `RESPONSETYPE` as **token**

    So the final postman URL should look like this:

```
<<tokenendpoint>>?grant_type=client_credentials&response_type=token

<<tokenendpoint>> is to be replaced with the 'tokenendpoint' field of the service key.
In the Headers tab, enter `Content-Type` as KEY and `application/x-www-form-urlencoded` as VALUE.

```

![postman headers](https://raw.githubusercontent.com/sap-tutorials/Tutorials/master/tutorials/cp-enterprisemessaging-test-queue-sendreceive/postman-header.PNG)

In the **Authorization** tab, select the **Type** as `Basic Auth` from the dropdown.

- In **Username**, provide the <`clientid`> value from the **Service Keys** for `httprest` protocol.
- In **Password**, provide the <`clientsecret`> value from the **Service Keys** for `httprest` protocol.

      ![postman authorization](https://raw.githubusercontent.com/sap-tutorials/Tutorials/master/tutorials/cp-enterprisemessaging-test-queue-sendreceive/postman-authorization.PNG)

Select the **POST** option in **Postman** and click on the **Send** button. You will get the `access_token`.


### Send message to the queue
    

Open a new tab in the Postman.

  1. Build the postman URL as below
        https://<`uri` of the rest protocol based section from **Service Keys**>`/messagingrest/v1/queues/<Queue name>/messages`.
        `Queue name` is queue name along with the namespace. Replace the `/` present in the namespace with `%2f`while executing.  

  2. Open the **Headers** tab add below two key-value pairs.

   |       KEY      |                 VALUE                 |
   | :------------- | :------------------------------------ |
   |      x-qos     |                 0 or 1                |
   | authorization  | Bearer <the retrieved `access_token` >|     

   ![postman header for publishing message](https://raw.githubusercontent.com/sap-tutorials/Tutorials/master/tutorials/cp-enterprisemessaging-test-queue-sendreceive/postman-post-header.PNG)

  3. Open the **Authorization** tab and select the **TYPE** as `No Auth`.

   ![postman authorization for publishing message](https://raw.githubusercontent.com/sap-tutorials/Tutorials/master/tutorials/cp-enterprisemessaging-test-queue-sendreceive/postman-post-authorization.PNG)

  4. Open the **Body** tab and select the type as **raw**. And enter some test message in the body.

   ![postman body for publishing message](https://raw.githubusercontent.com/sap-tutorials/Tutorials/master/tutorials/cp-enterprisemessaging-test-queue-sendreceive/Postman-Post-Body.PNG)

  5. Select the **POST** option in **Postman** and click on the **Send** button. If sending message is successful, you shall get a status as `204 No Content`.


### Receive message from queue
    

Open a new tab in the Postman.

  1. Build the postman URL as below
        https://< `uri` of the rest protocol based section from **Service Keys**>`/messagingrest/v1/queues/<Queue name>/messages/consumption`

  2. Open the **Headers** tab add below two key value pair.

   |       KEY      |                 VALUE                 |
   | :------------- | :------------------------------------ |
   |      x-qos     |                 0 or 1                |
   | authorization  | Bearer <the retrieved `access_token` >|     

   ![postman header for publishing message](https://raw.githubusercontent.com/sap-tutorials/Tutorials/master/tutorials/cp-enterprisemessaging-test-queue-sendreceive/consumption-header.PNG)

  3. Open the **Authorization** tab and select the TYPE as **No Auth**.

   ![postman authorization for publishing message](https://raw.githubusercontent.com/sap-tutorials/Tutorials/master/tutorials/cp-enterprisemessaging-test-queue-sendreceive/consumption-noauth.PNG)

  4. Open the **Body** tab and select the type as **raw**. And enter some test message in the body.

  5. Select the **POST** option in **Postman** and click on the **Send** button. If sending message is successful, you shall get a status as `200 OK`. And in the body tab you can view the message.




---