# Shared Content
source: https://developer.mastercard.com/mastercard-developers-api/documentation/sharedcontent/importpostman/index.md

Start using the Developers API without the need to write any code. Run the Developers API Postman Collection to explore and test all the endpoints.
> To get started using the Postman collection, you will need a [Postman account](https://identity.getpostman.com/signup?addAccount=1), and you can optionally download the [Postman desktop application](https://www.postman.com/downloads/).

1. Extract the signing key (private key) from your PKCS#12 keystore using the following command (use the passphrase protecting your PKCS#12 file):
   * OpenSSL

   ```OpenSSL
   openssl pkcs12 -in 'mykey.p12' -nocerts -nodes -passin pass:{password} | openssl rsa -out mykey.pem
   ```

   Expected result:  

   ```java
   -----BEGIN RSA PRIVATE KEY-----
   MIIEpQIBAAKCAQEAzSdC+wm6Dv4ynlhU5tuMLMsX7AeMWoysQKAaCDCStEWUHyj4
   K84X+ZQH0kIJkpWS0M1+vWHTSAu0QvHNDPRIJKMNE2cCRVKApVZ8jQ9DhFkVYE0j
   AhggCNQTJ0kXDBvc1mZPOJDmXusvHIG3BbRSE6ohZHoUXAuAg4bbwZwmvgDgMrmN
   9A9upgMrVZMfrCWeKiBUKoGnwGwUf0iMiHXJhD1Wjdtf0+VAsZNI7r05n9FTHmiC
   ...
   YlR8szTbz1WEx//hU5Ea2sfcKmPDTNWQnx0IgSmPu5I9qf7KJxSYhOk=
   -----END RSA PRIVATE KEY-----
   ```

2. Click the following links to open the files in a new tab:   
   [mastercard_developers_api_postman.json](https://static.developer.mastercard.com/content/mastercard-developers-api/swagger/mastercard_developers_api_postman.json) (23KB)   
   [mastercard_developers_api_postman_environment.json](https://static.developer.mastercard.com/content/mastercard-developers-api/swagger/mastercard_developers_api_postman_environment.json) (562B)
3. Copy the content from each tab, paste it into a text editor (e.g., Notepad), and save as:
   * `mastercard_developers_api_postman.json` for the collection.
   * `mastercard_developers_api_postman_environment.json` for the environment.
4. In Postman, click **Import** and import **mastercard_developers_postman.json** and **mastercard_developers_postman_environment.json** :

   ![Import Postman Collection](https://static.developer.mastercard.com/content/mastercard-developers-api/uploads/postman-import-button.png)
5. Click **Environments** , then select **Mastercard Developers** . Copy the Consumer Key from the Developers API keys section of your Account page and update the `consumerKey` variable. Use the private key extracted in step 1 and update the `privateKey` variable.

   ![Postman Environment](https://static.developer.mastercard.com/content/mastercard-developers-api/uploads/postman-environment-keys_3.png)
6. You can then test the other endpoints by clicking **Send** on individual requests, or **Run collection**.