rm-ventas/services-externos/src/ServicesExternos.API/Services/TransbankService.cs

using System.Text;
using Newtonsoft.Json;
using ServicesExternos.API.Models;
using Dapper;
using Npgsql;

namespace ServicesExternos.API.Services;

public class TransbankService
{
    private readonly HttpClient _client;
    private readonly string _apiKey;
    private readonly string _commerceCode;
    private readonly string _connectionString;
    private readonly string _environment;

    public TransbankService(HttpClient client, IConfiguration configuration)
    {
        _client = client;
        _apiKey = configuration["Transbank:ApiKey"] ?? throw new Exception("Transbank:ApiKey required");
        _commerceCode = configuration["Transbank:CommerceCode"] ?? throw new Exception("Transbank:CommerceCode required");
        _connectionString = configuration.GetConnectionString("Default")!;
        _environment = configuration["Transbank:Environment"] ?? "integration";

        var baseUrl = _environment == "production"
            ? "https://webpay3g.transbank.cl"
            : "https://webpay3gint.transbank.cl";

        _client.BaseAddress = new Uri(baseUrl);
        _client.DefaultRequestHeaders.Add("Tbk-Api-Key-Id", _commerceCode);
        _client.DefaultRequestHeaders.Add("Tbk-Api-Key-Secret", _apiKey);
    }

    public async Task<string> CrearTransaccionAsync(TransbankTransactionRequest request)
    {
        var payload = new
        {
            buy_order = request.BuyOrder,
            session_id = request.SessionId,
            amount = request.Amount,
            return_url = request.ReturnUrl
        };

        var json = JsonConvert.SerializeObject(payload);
        var content = new StringContent(json, Encoding.UTF8, "application/json");
        var response = await _client.PostAsync("/rswebpaytransaction/api/webpay/v1.2/transactions", content);
        return await response.Content.ReadAsStringAsync();
    }

    public async Task<string> ConfirmarTransaccionAsync(string tokenWs)
    {
        var response = await _client.PutAsync($"/rswebpaytransaction/api/webpay/v1.2/transactions/{tokenWs}", null);
        return await response.Content.ReadAsStringAsync();
    }

    public async Task<string> GrabarVoucherAsync(string token, string accountingDate, string buyOrder,
        string cardNumber, string authCode, string paymentType, string sharesNumber, int amount)
    {
        using var connection = new NpgsqlConnection(_connectionString);
        await connection.ExecuteAsync(
            "caja_tbk.GrabaVoucher",
            new
            {
                token_id = token,
                xaccountingDate = accountingDate,
                xbuyOrder = buyOrder,
                xcardDetailcardNumber = cardNumber,
                xdetailOutputAuthorizationCode = authCode,
                xdetailOutputPaymentTypeCode = paymentType,
                xdetailOutputSharesNumber = sharesNumber,
                xdetailOutputAmount = amount
            },
            commandType: System.Data.CommandType.StoredProcedure);
        return "ok";
    }

    public async Task<string> BuscarTransaccionAsync(string token)
    {
        using var connection = new NpgsqlConnection(_connectionString);
        var rows = await connection.QueryAsync(
            "caja_tbk.BuscarInfoToken",
            new { tokenid = token },
            commandType: System.Data.CommandType.StoredProcedure);
        return JsonConvert.SerializeObject(rows);
    }
}