What criteria must a custom application meet to support password rotation via Password Safe Cloud REST API?

Hello ​@AmilaK 

There are a few ways PasswordSafe can manage credentials.
You can onboard one of our supported platforms. https://docs.beyondtrust.com/bips/docs/ps-supported-platforms 
You can also use a "Custom Platform", a custom platform uses SSH to connect to and manage credentials. 
A custom platform is any application \ system that you can connect to via SSH and issue commands to change a password you could create a Custom Platform.
For an application that is not on our supported platform list or is not SSH enabled you could use our Password Safe Software Development Kit https://docs.beyondtrust.com/bips/docs/ps-sdk 
The SDK allows you to create a plugin in C# that can be added to PasswordSafe to manage your custom application. 
The SDK code generator creates all the scaffolding required for your plugin, with stub implementations of password checking and changing. You code the details of how the checks and changes are done. 
You can get the Password Safe SDK from our Password Safe Resource Kit that can be downloaded from our Customer Portal https://beyondtrustcorp.service-now.com/csm 
Have a look at the included "Platform Plugin Resource Kit Readme.pdf" for details on setting the SDK in Visual Studio.

Once you have added your application as a managed system and added some managed accounts you can use the Password Safe API to rotate the credentials.
The specific API call to do the change is "POST ManagedAccounts/{managedAccountID}/Credentials/Change"
Here is a link to our Rest API Guide.
https://docs.beyondtrust.com/bips/docs/password-safe-apis#post-managedaccountsmanagedaccountidcredentialschange

For API sample code have a look in the Resource Kit mentioned above in the "API Samples" section. We have sample code in various languages.

Also for a walkthrough on Configuring, testing, and troubleshooting Password Safe API please have a look at this KB.https://beyondtrustcorp.service-now.com/csm?id=kb_article_view&sysparm_article=KB0017018

Hopefully this helps,

Regards,

John