Creates a relationship between a member and a group. The following identifiers must be specified: GroupId, IdentityStoreId, and MemberId.
See https://www.paws-r-sdk.com/docs/identitystore_create_group_membership/ for full documentation.
identitystore_create_group_membership(IdentityStoreId, GroupId, MemberId)[required] The globally unique identifier for the identity store.
[required] The identifier for a group in the identity store.
[required] An object that contains the identifier of a group member. Setting the
UserID field to the specific identifier for a user indicates that the
user is a member of the group.