Specifies which credential to use in order to connect to Google Play.

The selected credential must be a "Google Service Account from private key" — if you have not added one already, refer to the documentation on this plugin's page.

By choosing the "Parameter expression" option, you can also provide a credential at build time, either from an environment variable, or from a build parameter, e.g. the Credentials Parameter type.
But you can use any type of expression, so long as it expands to the name of a "Google Service Account from private key" credential at build time.

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This field supports substituting environment variables in the form ${SOME_VARIABLE} at build time.
Note that variables in the form $SOME_VARIABLE are not accepted by the Credentials Plugin.