public void setInvitationId(String invitationId) {
        this.invitationId = invitationId;
    }
<p>
The unique identifier of the invitation to reject.
</p>

@param invitationId
       The unique identifier of the invitation to reject.
aws-java-sdk-managedblockchain/src/main/java/com/amazonaws/services/managedblockchain/model/RejectInvitationRequest.java