bindSignatureCard() {
    // set signature node card to the player's current card or fallback to reference card
    // this way the signature card is always showing
    let referenceCard;
    let currentCard;
    const sdkPlayer = this.getSdkPlayer();
    if (sdkPlayer != null) {
      referenceCard = sdkPlayer.getReferenceSignatureCard();
      currentCard = sdkPlayer.getCurrentSignatureCard();
    }

    if (this._canShowSignatureCardNode && !this._signatureCardNode.getIsDisabled() && (currentCard != null || referenceCard != null)) {
      this._signatureCardNode.setVisible(true);
      this._signatureCardNode.setSdkCard(currentCard || referenceCard);
      this._signatureCardNode.resetHighlightAndSelection();
    } else {
      this._signatureCardNode.setVisible(false);
    }
  }
Binds this view to this layer's player's current signature card as set in the model (SDK layer). Immediately will update signature card node to show the current state.