안녕하세요 인증서버 500 에러 코드 반환 문의드립니다

니 500
.NET 로 BE ,
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public async Task<ActionResult> TossPayAuth(string code, string customerKey) {
byte[] bytes = Encoding.Unicode.GetBytes("...:");
string base64 = Convert.ToBase64String(bytes);

HttpClient client = new ();
client.BaseAddress = new Uri("https://api.tosspayments.com/");
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", base64);
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

HttpResponseMessage response = await client.PostAsJsonAsync("/v1/brandpay/authorizations/access-token", new {
grantType = "AuthorizationCode",
customerKey,
code
});
response.EnsureSuccessStatusCode();
}
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