satellite/payments/storjscan: payment API type add USD value

Change-Id: I6e06a5557df795b4f91dd52b191384d7e6b4b07c

satellite/payments/storjscan/client.go

@@ -35,6 +35,7 @@ type Payment struct {
 	From        blockchain.Address
 	To          blockchain.Address
 	TokenValue  *big.Int
+	USDValue    float64
 	BlockHash   blockchain.Hash
 	BlockNumber int64
 	Transaction blockchain.Hash

satellite/payments/storjscan/client_test.go

@@ -30,6 +30,7 @@ func TestClientMocked(t *testing.T) {
 			From:        blockchaintest.NewAddress(),
 			To:          blockchaintest.NewAddress(),
 			TokenValue:  new(big.Int).SetInt64(int64(i)),
+			USDValue:    float64(i) + 0.1,
 			BlockHash:   blockchaintest.NewHash(),
 			BlockNumber: int64(i),
 			Transaction: blockchaintest.NewHash(),