code: public void setPurchaseRequests(java.util.Collection<PurchaseRequest> purchaseRequests) {
          if (purchaseRequests == null) {
              this.purchaseRequests = null;
              return;
          }
  
          this.purchaseRequests = new com.amazonaws.internal.SdkInternalList<PurchaseRequest>(purchaseRequests);
      }
docs: <p>
  The purchase requests.
  </p>
  
  @param purchaseRequests
  The purchase requests.