EOS_InitializeOptions SDKOptions;
SDKOptions.ApiVersion = EOS_INITIALIZE_API_LATEST;
SDKOptions.AllocateMemoryFunction = NULL;
SDKOptions.ReallocateMemoryFunction = NULL;
SDKOptions.ReleaseMemoryFunction = NULL;
SDKOptions.ProductName = "MyProduct";
SDKOptions.ProductVersion = "1.0";
SDKOptions.Reserved = NULL;
SDKOptions.SystemInitializeOptions = NULL;
EOS_Initialize(&SDKOptions);

/** API version of EOS_Platform_Create. */
int32_t ApiVersion;
/** A reserved field that should always be nulled. */
void* Reserved;
/** The product id for the running application, found on the dev portal */
const char* ProductId;
/** The sandbox id for the running application, found on the dev portal */
const char* SandboxId;
/** Set of service permissions associated with the running application */
EOS_Platform_ClientCredentials ClientCredentials;
/** Is this running as a server */
EOS_Bool bIsServer;
/** Only used by Player Data Storage. Must be null initialized if unused. 256-bit Encryption Key for file encryption in hexadecimal format (64 hex chars)*/
const char* EncryptionKey;
/** The override country code to use for the logged in user. (EOS_COUNTRYCODE_MAX_LENGTH)*/
const char* OverrideCountryCode;
/** The override locale code to use for the logged in user. This follows ISO 639. (EOS_LOCALECODE_MAX_LENGTH)*/
const char* OverrideLocaleCode;
/** The deployment id for the running application, found on the dev portal */
const char* DeploymentId;
/** Platform creation flags, e.g. EOS_PF_LOADING_IN_EDITOR. This is a bitwise-or union of the defined flags. */
uint64_t Flags;
/** Only used by Player Data Storage. Must be null initialized if unused. Cache directory path. Absolute path to the folder that is going to be used for caching temporary data. The path is created if it's missing. */
const char* CacheDirectory;
/**
 * A budget, measured in milliseconds, for EOS_Platform_Tick to do its work. When the budget is met or exceeded (or if no work is available), EOS_Platform_Tick will return.
 * This allows your game to amortize the cost of SDK work across multiple frames in the event that a lot of work is queued for processing.
 * Zero is interpreted as "perform all available work"
 */
uint32_t TickBudgetInMilliseconds;

EOS_Platform_Options PlatformOptions;
PlatformOptions.ApiVersion = EOS_PLATFORM_OPTIONS_API_LATEST;
PlatformOptions.Reserved = NULL;
PlatformOptions.bIsServer = false;
PlatformOptions.EncryptionKey = NULL;
PlatformOptions.OverrideCountryCode = NULL;
PlatformOptions.OverrideLocaleCode = NULL;
PlatformOptions.Flags = 0;
PlatformOptions.CacheDirectory = "path/to/cache/directory";

PlatformOptions.ProductId = "product id";
PlatformOptions.SandboxId = "sandbox id";
PlatformOptions.DeploymentId = "deployment id";
PlatformOptions.ClientCredentials.ClientId = "client id";
PlatformOptions.ClientCredentials.ClientSecret = "client secret";
EOS_HPlatform platformInterface = EOS_Platform_Create(&PlatformOptions);

EOS_HConnect connectInterface = EOS_Platform_GetConnectInterface(platformInterface);

EOS_Connect_LoginOptions loginOptions;
loginOptions.ApiVersion = EOS_CONNECT_LOGIN_API_LATEST;
loginOptions.UserLoginInfo = NULL;
loginOptions.Credentials = &connectCredentials;

EOS_Connect_Credentials connectCredentials;
connectCredentials.ApiVersion = EOS_CONNECT_CREDENTIALS_API_LATEST;
connectCredentials.Token = "jwt token";
connectCredentials.Type = EOS_EExternalCredentialType::EOS_ECT_OPENID_ACCESS_TOKEN;

EOS_Connect_Login(
  connectHandle,
  &loginOptions,
  NULL,
  &onLoginConnect
);

static void EOS_CALL onLoginConnect(const EOS_Connect_LoginCallbackInfo *Data);

/** Result code for the operation. EOS_Success is returned for a successful query, otherwise one of the error codes is returned. See eos_result.h */
EOS_EResult ResultCode;
/** Context that was passed into EOS_Connect_Login */
void* ClientData;
/** If login was successful, this is the account ID of the local player that logged in */
EOS_ProductUserId LocalUserId;
/**
* If the user was not found with credentials passed into EOS_Connect_Login,
* this continuance token can be passed to either EOS_Connect_CreateUser
* or EOS_Connect_LinkAccount to continue the flow
*/
EOS_ContinuanceToken ContinuanceToken;

static void EOS_CALL onLoginConnect(const EOS_Connect_LoginCallbackInfo *Data) {
  if (Data->ResultCode == EOS_EResult::EOS_InvalidUser) {
    continuanceToken = Data->ContinuanceToken;
  }
  if (Data->ResultCode == EOS_EResult::EOS_Success) {
    userId = Data->LocalUserId;
  }
}

EOS_Connect_CreateUserOptions options;
options.ApiVersion = EOS_CONNECT_CREATEUSER_API_LATEST;
options.ContinuanceToken = continuanceToken;
EOS_Connect_CreateUser(
  connectHandle,
  &options,
  NULL,
  &onCreateUser
);

static void EOS_CALL onCreateUser(const EOS_Connect_CreateUserCallbackInfo *Data) {
  if (Data->ResultCode == EOS_EResult::EOS_Success) {
    userId = Data->LocalUserId;
  }
}
/** Result code for the operation. EOS_Success is returned for a successful query, otherwise one of the error codes is returned. See eos_result.h */
EOS_EResult ResultCode;
/** Context that was passed into EOS_Connect_CreateUser */
void* ClientData;
/** Account ID of the local player created by this operation */
EOS_ProductUserId LocalUserId;