public async Task <ActionResult <IEnumerable <PlaceProvider> > > OrderRegistrations(
     [FromForm] string placeProviderId,
     [FromForm] int registrations,
     [FromForm] string currency
     )
 {
     try
     {
         if (!currency.ValidateCurrency())
         {
             throw new Exception("Invalid currency");
         }
         if (registrations < 0)
         {
             throw new Exception("Invalid registrations");
         }
         if (!User.IsAuthorizedToIssueInvoice(userRepository, placeProviderRepository, placeProviderId))
         {
             throw new Exception("You are not authorized to issue invoices for this company. Please contact administrator or accountant.");
         }
         return(Ok(placeProviderRepository.IssueProformaInvoiceRegistrations(placeProviderId, registrations, currency)));
     }
     catch (Exception exc)
     {
         logger.LogError(exc, exc.Message);
         return(BadRequest(new ProblemDetails()
         {
             Detail = exc.Message
         }));
     }
 }