Input paraments are available in vRO8 payload only in very early stages of deployment. For example you can easily get them in Deployment requested stage as a vRO8 payload in inputProperties variable
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But what if you want to have access to your inputs data later in deployment process? You can of course make a REST call to vRA, get the deployment data and in deployment JSON you will find all the inputs. But REST calls also cost some time, and if you do a lot of them, this will add up to your VM deployment time.
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