src/main/java/com/passkit/grpc/Integration.java
public Builder clearDestinationFieldKey() {
        
        destinationFieldKey_ = getDefaultInstance().getDestinationFieldKey();
        onChanged();
        return this;
      }
/**
       * <pre>
       * Field string key of destination data field.
       * </pre>
       *
       * <code>string destinationFieldKey = 1;</code>
       * @return This builder for chaining.
       */

Field string key of destination data field.

string destinationFieldKey = 1;
@return This builder for chaining.
Field string key of destination data field . string destinationFieldKey = 1 ; @return This builder for chaining .
public Builder clearDestinationFieldKey() {
        destinationFieldKey_ = getDefaultInstance().getDestinationFieldKey();
        onChanged();
        return this;
      }
public Builder clearDestinationFieldKey ( ) { destinationFieldKey_ = getDefaultInstance ( ) . getDestinationFieldKey ( ) ; onChanged ( ) ; return this ; }
<pre>
 Field string key of destination data field.
<pre > Field string key of destination data field .