How to Invoke Party Usage API using groovy script upon save Button

Hello Team,

Once a Party is created we have to tag a default custom usage. I was thing of a groovy script where it can call Party Usage API to add the custom usage once it is created? Can you please let me know how can i invoke this API using groovy script

Do you have a any other suggestions here where we can add a custom usage once a party is created?

Thanks,

Harshini