You need to invoke login Rest API to get the authentication token, and then you can invoke Grid Management API using that token ( thisis prerequisite). Please refer REST API BAO calls reference - Documentation for BMC Atrium Orchestrator Platform 8.0 - BMC Documentation .
You can also consume OOB Grid Management module (which consumes Rest adapter) to perform Adapter actions Grid Management module - Documentation for BMC Atrium Orchestrator Content 20.17.01 - BMC Documentation
Thanks for replying and giving the suggestions. I am now using the module “grid management module” but this module is using REST module as well. So my doubt is to run the REST workflows, is there any separate adapter which is to be used or the same http adapter can be used. As I am getting an error of “there is no instance of rest adapter running on any peer”
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Rest Adapter processes are part of OOB Autopilot-AD-Utilities and you also need to enable the rest adapter, please go through the prerequisite of BAO GM module configuration as well in docs. Grid Management module - Documentation for BMC Atrium Orchestrator Content 20.17.01 - BMC Documentation