Create Bitly Custom Backhalf (Public)

bitlyservice.cs

public async Task<string> GetShortUrl(string longUrl, string customBitLink)
{
    var shortContent = $"{{\"long_url\":\"{longUrl}\",\"group_guid\":\"groupGuid\",\"domain\":\"domain.com\"}}";

    var shortenUrlRequest = new HttpRequestMessage(HttpMethod.Post, ShortenUrl)
    {
        Content = new StringContent(shortContent, Encoding.UTF8, "application/json")
    };

    shortenUrlRequest.Headers.Authorization = new AuthenticationHeaderValue("Bearer", _appSettings.BitlyApiToken);

    var shortenUrlResponse = await _httpClient.SendAsync(shortenUrlRequest).ConfigureAwait(false);

    if (!shortenUrlResponse.IsSuccessStatusCode)
        return longUrl;

    var shortenUrlResponseString = await shortenUrlResponse.Content.ReadAsStringAsync();

    var shortenUrlJsonResponse = JsonConvert.DeserializeObject<dynamic>(shortenUrlResponseString);
    string shortLinkId = Convert.ToString(shortenUrlJsonResponse["id"]);

    var content = $"{{\"bitlink_id\":\"{shortLinkId}\",\"custom_bitlink\":\"{customBitLink}\",\"group_guid\":\"groupGuid\",\"domain\":\"domain.com\"}}";

    var backHalfRequest = new HttpRequestMessage(HttpMethod.Post, CustomBackHalfBitLinkUrl)
    {
        Content = new StringContent(content, Encoding.UTF8, "application/json")
    };

    backHalfRequest.Headers.Authorization = new AuthenticationHeaderValue("Bearer", _appSettings.BitlyApiToken);
        
    var backHalfResponse = await _httpClient.SendAsync(backHalfRequest);

    if (!backHalfResponse.IsSuccessStatusCode)
        return longUrl;

    var backHalfResponseString = await backHalfResponse.Content.ReadAsStringAsync();

    var backHalfResponseJson = JsonConvert.DeserializeObject<dynamic>(backHalfResponseString);
    string customBitLinkUrl = Convert.ToString(backHalfResponseJson["custom_bitlink"]);

    return customBitLinkUrl;
}