/// <summary>
/// Returns a list of all of GatewayProviders of GatewayProviderType Payment
///
/// GET /umbraco/Merchello/NotificationGatewayApi/GetAllGatewayProviders/
/// </summary>
/// <returns>
/// A collection for <see cref="GatewayResourceDisplay"/>
/// </returns>
public IEnumerable <GatewayProviderDisplay> GetAllGatewayProviders()
{
var providers = _notificationContext.GetAllActivatedProviders();
if (providers == null)
{
throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.NotFound));
}
return(providers.Select(provider => provider.GatewayProviderSettings.ToGatewayProviderDisplay()));
}