src/main/java/com/google/firebase/messaging/Message.java [182:217]:
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    public Builder setNotification(Notification notification) {
      this.notification = notification;
      return this;
    }

    /**
     * Sets the Android-specific information to be included in the message.
     *
     * @param androidConfig An {@link AndroidConfig} instance.
     * @return This builder.
     */
    public Builder setAndroidConfig(AndroidConfig androidConfig) {
      this.androidConfig = androidConfig;
      return this;
    }

    /**
     * Sets the Webpush-specific information to be included in the message.
     *
     * @param webpushConfig A {@link WebpushConfig} instance.
     * @return This builder.
     */
    public Builder setWebpushConfig(WebpushConfig webpushConfig) {
      this.webpushConfig = webpushConfig;
      return this;
    }

    /**
     * Sets the information specific to APNS (Apple Push Notification Service).
     *
     * @param apnsConfig An {@link ApnsConfig} instance.
     * @return This builder.
     */
    public Builder setApnsConfig(ApnsConfig apnsConfig) {
      this.apnsConfig = apnsConfig;
      return this;
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src/main/java/com/google/firebase/messaging/MulticastMessage.java [139:174]:
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    public Builder setNotification(Notification notification) {
      this.notification = notification;
      return this;
    }

    /**
     * Sets the Android-specific information to be included in the message.
     *
     * @param androidConfig An {@link AndroidConfig} instance.
     * @return This builder.
     */
    public Builder setAndroidConfig(AndroidConfig androidConfig) {
      this.androidConfig = androidConfig;
      return this;
    }

    /**
     * Sets the Webpush-specific information to be included in the message.
     *
     * @param webpushConfig A {@link WebpushConfig} instance.
     * @return This builder.
     */
    public Builder setWebpushConfig(WebpushConfig webpushConfig) {
      this.webpushConfig = webpushConfig;
      return this;
    }

    /**
     * Sets the information specific to APNS (Apple Push Notification Service).
     *
     * @param apnsConfig An {@link ApnsConfig} instance.
     * @return This builder.
     */
    public Builder setApnsConfig(ApnsConfig apnsConfig) {
      this.apnsConfig = apnsConfig;
      return this;
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