// Collections
/// <summary>
/// Return’s a list of all collections.
/// </summary>
/// <param name="limit">maximum number of results</param>
/// <param name="offset">number of results to displace or skip over</param>
/// <param name="page">number of results of limit length to displace or skip over</param>
/// <returns></returns>
public async Task <IEnumerable <Models.Collection> > GetCollectionsAsync(int?limit = null, int?offset = null, int?page = null)
{
IRestRequest restRequest = _requestBuilder.GetCollectionsRequest(limit, offset, page);
var response = await _client.ExecuteTaskAsync(restRequest);
return(HandleResponse <CollectionsResponse, IEnumerable <Models.Collection> >(response.StatusCode, response.Content, res => res?.Collections));
}