Catchpoint supports the use of Personal Certificates for URLs that require them. This is supported Web and Transaction Tests (using the Emulated or Object monitor), API tests, Playwright tests, and Puppeteer tests.
This feature only allows PKCS#12 certificatefiles (.pfx, .p12)
A certificate can be uploaded at the Test level. When creating/editing a test using a supported monitor, under Test Properties > Requests you will see the Certificate option.

Click on the Upload Certificate link and then select your certificate to upload.
It will then show the certificate and the option to specify a Passphrase if there is one associated with that certificate. Enable this optional and input the passphrase if needed.

Once that is done, the Test will use the certificate when accessing the URL you are testing.
In Playwright and Puppeteer tests, certificates can be applied to the primary test URL or specific child hosts. After choosing the certificate, apply a custom header. If a custom header isn’t applied, then the certificate will be applied to the primary test URL.

Note: The custom header name must be set as “Cp-ClientCert” and value must be set as “1”.