docs: public void marshall(Invitation invitation, ProtocolMarshaller protocolMarshaller) {
  
          if (invitation == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(invitation.getAccountId(), ACCOUNTID_BINDING);
              protocolMarshaller.marshall(invitation.getInvitationId(), INVITATIONID_BINDING);
              protocolMarshaller.marshall(invitation.getInvitedAt(), INVITEDAT_BINDING);
              protocolMarshaller.marshall(invitation.getRelationshipStatus(), RELATIONSHIPSTATUS_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }