Hi Siddharth

You can put whatever property you want in the Properties list of your SerializableCart. It is just a Hashtable of object. So no need or way to define custom MetaFields for a SerializableCart.

However, when you convert the SerializableCart to a PurchaseOrder, the property names and types have to match the known MetaFields on the PuchaseOrder MetaClass (and related types). So best to use the same property keys as the MetaField names.

If you've already been using non serialzed when converting to serialized everything should work fine as you've obviously already got all the fields set up for non-serialized/purchase orders. It just used JSON serialization, a few points to cadveat to be wary of

1. When moving to the future be careful what types you use. Types like Money work fine in serialized carts but not so much with POs. Be careful of the types you use that they work still in the purchase order.
2. If you have any searching code that searches by metafield using the helper methods these do not work when using serializable carts. I had to write my own SQL queries https://world.episerver.com/forum/developer-forum/Episerver-Commerce/Thread-Container/2018/4/searching-through-serialized-carts-11-8-2/