V3 REST Api to deploy app from template

Hi,

I am trying to create app using v3 api. I’m making a post call to https://{instance_address}/v3/project/{project id}/apps with json data

{
“name”:“app-1234”,
“namespace”: “app-1234”
}

it is creating an empty app but I am unable to find parameter to pass template to deploy along with this payload.

Set externalId of the app to theexternalId of a templateVersion (/v3/templates -> pick a template, click on one of the versionLinks, get externalId of that version)

Vincent. Thanks for the direction, it helped.
I am able to deploy catalog now.