Sample of how to replace the content serializer in uSync with something that doesn't serialize certain properties. (would need testing)

CustomContentPropertySerializer.cs

using Umbraco.Core;
using Umbraco.Core.Composing;
using Umbraco.Core.Logging;
using Umbraco.Core.Models;
using Umbraco.Core.Services;

using uSync8.ContentEdition.Mapping;
using uSync8.Core;
using uSync8.Core.Serialization;

namespace uSync8.ContentEdition.Serializers
{
    [ComposeAfter(typeof(uSync8.ContentEdition.uSyncContentComposer))]
    public class CustomContentComposer : IUserComposer
    {
        public void Compose(Composition composition)
        {
            composition.Register<ISyncSerializer<IContent>, CustomContentPropertySerializer>();
        }
    }

    [SyncSerializer("", "contentPropertySerializer", uSyncConstants.Serialization.Content)]
    public class CustomContentPropertySerializer : ContentSerializer
    {
        public CustomContentPropertySerializer(IEntityService entityService, ILocalizationService localizationService, IRelationService relationService, ILogger logger, IContentService contentService, IFileService fileService, SyncValueMapperCollection syncMappers)
            : base(entityService, localizationService, relationService, logger, contentService, fileService, syncMappers)
        {
            this.dontSerialize = new string[] { "myPayPalPropertyAlias" };
        }
    }
}