Json

@JsonNaming(PropertyNamingStrategy.SnakeCaseStrategy.class)

@JsonProperty("access_token")
private String accessToken;

@JsonFormat(timezone = "GMT+8", pattern = "yyyy-MM-dd HH:mm:ss")
@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
@JsonProperty("expires_at")
private Date expiresAt;