curl -X POST "https://mydiscount.eservicii.md/MyDiscountApp/erp/AddBonus" \
  -H "Content-Type: application/json" \
  -d '{
    "APIKey": "11111111-2222-3333-4444-555555555555",
    "CardID": "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee",
    "Amount": 25.00,
    "CashBack": 5.0,
    "Details": "Invoice #INV-12345",
    "DateTimeOfSale": "2026-04-30T14:35:00",
    "PlaceOfSale": "Central Store, Cashier 3"
  }'

// 1. 
var auth = await client.GetFromJsonAsync<ResponseAuthorizeCard>(
    $"AuthorizeCard?TID={tid}&APIKey={apiKey}&PlaceOfSale=Casa-1");

if (auth.ErrorCode != EnErrorCode.NoError)
    throw new Exception($"Invalid card: {auth.ErrorCode}");

// 2. 
var info = await client.PostAsJsonAsync("GetInfoBonusAmount",
    new { CardID = auth.Key, mAPIKey = apiKey });
var infoData = await info.Content.ReadFromJsonAsync<ResponseGetInfoBonusAmount>();

// 3. 
decimal deUsing = Math.Min(infoData.Amount, 80m);
var use = await client.PostAsJsonAsync("GetBonus", new CashData
{
    APIKey = apiKey, CardID = auth.Key, Amount = deUsing,
    Details = "Partial cashback",
    DateTimeOfSale = DateTime.Now, PlaceOfSale = "Casa-1"
});

// 4. 
decimal dePlatit = 80m - deUsing;

decimal totalBon = 200m;
decimal bonusDeAdaugat = totalBon * 0.05m;

var add = await client.PostAsJsonAsync("AddBonus", new CashData
{
    APIKey = apiKey, CardID = cardId,
    Amount = bonusDeAdaugat, CashBack = 5m,
    Details = $"Cashback 5% on bill {billId}",
    DateTimeOfSale = DateTime.Now, PlaceOfSale = "Casa-1"
});

var result = await add.Content.ReadFromJsonAsync<ResponseSetCashBack>();

// 1. 
var allErpCards = await _erp.GetAllLoyaltyCardsAsync();  // e.g. 12,500 cards

// 2. 
const int batchSize = 1500;
int totalInserted = 0, totalUpdated = 0, totalSkipped = 0;

for (int i = 0; i < allErpCards.Count; i += batchSize)
{
    var batch = allErpCards.Skip(i).Take(batchSize).ToList();

    var request = new BulkImportRequest
    {
        APIKey           = apiKey,
        UniqueIdentifier = UniqueField.ExternalId,  // match după ID-ul ERP
        PurgeExisting    = false,                    // sync, nu reset
        Items = batch.Select(c => new CompanyCardImportItem
        {
            ExternalId        = c.ErpId,
            Barcode           = c.Barcode,
            Phone             = c.CustomerPhone,
            AccumulatedAmount = c.Balance,
            Category          = c.IsVip ? CardCategory.VIP : CardCategory.Standard,
            Status            = c.IsActive ? CardStatus.Active : CardStatus.Blocked,
            IssuedAt          = c.CreatedAt,
            ExpiresAt         = c.ValidUntil
        }).ToList()
    };

    var resp = await client.PostAsJsonAsync("CompanyCards/bulk-import", request);
    var res  = await resp.Content.ReadFromJsonAsync<BulkImportResult>();

    if (!res.Ok)
    {
        _logger.LogError($"Batch {i} failed: {string.Join(';', res.Errors)}");
        continue;  // batch-urile sunt independente
    }

    totalInserted += res.InsertedCount;
    totalUpdated  += res.UpdatedCount;
    totalSkipped  += res.SkippedCount;
}

_logger.LogInformation(
    $"Sync complete: +{totalInserted} inserted, ~{totalUpdated} updated, {totalSkipped} skipped");