src/main/java/com/passkit/grpc/SingleUseCoupons/CouponOuterClass.java
public Builder clearCouponCampaignId() {
        
        couponCampaignId_ = getDefaultInstance().getCouponCampaignId();
        onChanged();
        return this;
      }
/**
       * <pre>
       * Coupon Campaign ID. Required if external id is used.
       * </pre>
       *
       * <code>string couponCampaignId = 2;</code>
       * @return This builder for chaining.
       */

Coupon Campaign ID. Required if external id is used.

string couponCampaignId = 2;
@return This builder for chaining.
Coupon Campaign ID . Required if external id is used . string couponCampaignId = 2 ; @return This builder for chaining .
public Builder clearCouponCampaignId() {
        couponCampaignId_ = getDefaultInstance().getCouponCampaignId();
        onChanged();
        return this;
      }
public Builder clearCouponCampaignId ( ) { couponCampaignId_ = getDefaultInstance ( ) . getCouponCampaignId ( ) ; onChanged ( ) ; return this ; }
<pre>
 Coupon Campaign ID.
<pre > Coupon Campaign ID .