Hi, I have created a certificate using app store connect api. I got the response body. Now, what is the next step? Do I need to copy the csrContent and decode it and change it to .p12 file? Please help. Thank you

Hi, I am working on the App Store Connect Api. I have problem with the creation of Certificates. Here is the snapshot of my code for Access Token and reference for certificates. https://developer.apple.com/documentation/appstoreconnectapi/create_a_certificate When i try using Postman, i got this error. Is my implementation wrong? If so, please help to guide me on this. Thank you.