Changes to POST /v1/recipient-group

the members/items request property type changed from string to object

added the new optional request property members/items/isEmail

added the new optional request property members/items/isPhone

added the new optional request property members/items/isSms

added the new optional request property members/items/memberUid

the members/items request property type changed from object to string

removed the request property members/items/isEmail

removed the request property members/items/isPhone

removed the request property members/items/isSms

removed the request property members/items/memberUid