# Configuring MTLS Certificate
source: https://developer.mastercard.com/account-to-account-commerce-for-csp/tutorial/insomnia/step_4/index.md

## Configuring Client Certificate {#configuring-client-certificate}

1. In the Environment section, click on the "Add Certificates" option to open the "Manage Certificates" page.  

   ![Addcertificate](https://static.developer.mastercard.com/content/account-to-account-commerce-for-csp/uploads/insomniaslides/addcert2.png)

2. Click the "Add Client Certificate" button, Enter the URL '<https://mtf.services.mastercard.co.in>' as the hostname, Choose PFX or PKCS12 option and upload the MTLS certificate. You would need to make sure to upload the MTLS as obtained from Key Management Portal and Create a Mastercard Developer Project using the Mastercard signed MTLS certificate. Also, enter the Passphrase used to generate the certificate signing request.
   ![clientcert](https://static.developer.mastercard.com/content/account-to-account-commerce-for-csp/uploads/insomniaslides/iesaddclientcertificate.png)

3. Once the client certificate is configured and enabled, click "Done."  

   ![Certenabled](https://static.developer.mastercard.com/content/account-to-account-commerce-for-csp/uploads/insomniaslides/iescertificateenabled.png)