// Create a request builder with app key and ad formats. Add User ID if available.
LPMInitRequestBuilder *requestBuilder = [[LPMInitRequestBuilder alloc] initWithAppKey:@"appKey"];
[requestBuilder withLegacyAdFormats:@[IS_REWARDED_VIDEO]];
[requestBuilder withUserId:@"UserId"];

// Build the initial request
LPMInitRequest *initRequest = [requestBuilder build];
// Initialize LevelPlay with the prepared request
[LevelPlay initWithRequest:initRequest completion:^(LPMConfiguration *_Nullable config, NSError *_Nullable error){
    if(error) {
        // There was an error on initialization. Take necessary actions or retry.
    } else {
    // Initialization was successful. You can now create ad objects and load ads.
    }
}];