code: public ContactDetail withExtraParams(ExtraParam... extraParams) {
          if (this.extraParams == null) {
              setExtraParams(new com.amazonaws.internal.SdkInternalList<ExtraParam>(extraParams.length));
          }
          for (ExtraParam ele : extraParams) {
              this.extraParams.add(ele);
          }
          return this;
      }
docs: <p>
  A list of name-value pairs for parameters required by certain top-level domains.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setExtraParams(java.util.Collection)} or {@link #withExtraParams(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param extraParams
  A list of name-value pairs for parameters required by certain top-level domains.
  @return Returns a reference to this object so that method calls can be chained together.