code: public static com.liferay.commerce.payment.model.CommercePaymentMethodGroupRel updateCommercePaymentMethodGroupRel(
  		com.liferay.commerce.payment.model.CommercePaymentMethodGroupRel commercePaymentMethodGroupRel) {
  		return getService()
  				   .updateCommercePaymentMethodGroupRel(commercePaymentMethodGroupRel);
  	}
docs: Updates the commerce payment method group rel in the database or adds it if it does not yet exist. Also notifies the appropriate model listeners.
  
  @param commercePaymentMethodGroupRel the commerce payment method group rel
  @return the commerce payment method group rel that was updated