Need to trigger a parameterised build when a pr with particular label is merged to master without manually triggering the build the job should be parameterised based on label

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Check that you didn't miss documentation https://github.com/KostyaSha/github-integration-plugin/tree/master/docs
Check that you correctly configure github-plugin in global settings.
Check that you sepcified GitHub project job property.
Post piece or the whole config.xml using GitHub markdown syntax. Describe what job type do you use.
Post GitHub XXX Polling Log action on left side of job or from triggered build
If you are using some advanced jenkins configuration handler describe it.
Check for logs in global settings jenkins system log.