Storing marketplaces values against the sales channel attribute (source_name)?

[Avalara]

Our team came across the list of Marketplaces currently integrated with Shopify on the following link: https://www.shopify.com/blog/online-selling-sites.

It has the following marketplaces:

• Amazon
• eBay
• Handshake
• Bonanza
• Ruby Lane
• Etsy
• Chairish
• Swappa
• Facebook Marketplace
• Craigslist
• Nextdoor
• VarageSale
• AliExpress
• Taobao
• OTTO
• Rakuten
• Mercado Libre
• Flipkart
• MyDeal

Can you please let us know, how the values of these marketplaces are stored/captured against the sales channel attribute (source_name)? i.e. Is Amazon is captured as Amazon or AMZ?"
Also, Can you please let us know where a user can see the source of transaction in their Shopify?"