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I would like to know in which cases the GetSellerTransactions call returns TransactionArray.Transaction.Status.CheckoutStatus the state SellerResponded.
If a buyer purchased an item and requested the seller for the total before completing checkout, then the TransactionArray.Transaction.Status.CheckoutStatus changes to BuyerRequestsTotal. Once the seller responds to this request for the buyer, the TransactionArray.Transaction.Status.CheckoutStatus changes to SellerResponded.
Below are sample snippets from the GetSellerTransactions for the transaction that show the transition of the CheckoutStatus field -
After buyer purchased the item
After buyer completes checkout -