feat: quote margin

fx.go

@@ -72,11 +72,12 @@ const (
 )
 
 type FXQuotePayload struct {
-	SellCurrency     string
-	BuyCurrency      string
-	InstructedAmount float64
-	FixedSide        QuoteFixedSide
-	ValueDate        string
+	SellCurrency     string         `json:"SellCurrency"`
+	BuyCurrency      string         `json:"BuyCurrency"`
+	InstructedAmount float64        `json:"InstructedAmount"`
+	FixedSide        QuoteFixedSide `json:"FixedSide"`
+	ValueDate        string         `json:"ValueDate"`
+	Margin           *float64       `json:"Margin,omitempty"`
 }
 
 type FXQuoteResponse struct {

fx_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	_ "embed"
+	"encoding/json"
 	"io"
 	"net/http"
 	"slices"
@@ -127,3 +128,17 @@ func TestFXQuoteResponse(t *testing.T) {
 	r2 := clearbank.FXQuoteResponse{SellCurrency: "EUR", BuyCurrency: "GBP", CurrencyPair: "GBP/EUR", ExchangeRate: 1.23}
 	require.Equal(t, 1/1.23, r2.GetRate())
 }
+
+func TestFXQuotePayload(t *testing.T) {
+	p1 := clearbank.FXQuotePayload{BuyCurrency: "USD", SellCurrency: "GBP"}
+	got1, err := json.Marshal(p1)
+	require.NoError(t, err)
+	require.Equal(t, `{"SellCurrency":"GBP","BuyCurrency":"USD","InstructedAmount":0,"FixedSide":"","ValueDate":""}`, string(got1))
+
+	margin := 0.002
+
+	p2 := clearbank.FXQuotePayload{BuyCurrency: "USD", SellCurrency: "GBP", Margin: &margin}
+	got2, err := json.Marshal(p2)
+	require.NoError(t, err)
+	require.Equal(t, `{"SellCurrency":"GBP","BuyCurrency":"USD","InstructedAmount":0,"FixedSide":"","ValueDate":"","Margin":0.002}`, string(got2))
+}