Merge pull request #1 from Iknite-Space/exchange_rate_service_init_

Implemented Transfers service

README.md

@@ -34,6 +34,8 @@ import "github.com/NdoleStudio/flutterwave-go"
 - **Payments**
   - `GET /v3/transactions/:id/verify`: Verify a transaction
   - `POST /v3/transactions/:id/refund`: Create a Refund
+- **Transfers**
+  - `GET /v3/transfers/rates`: Get the transfer rate of a transaction
 
 ## Usage
 

client.go

@@ -24,6 +24,7 @@ type Client struct {
 	Bills        *billsService
 	Payments     *paymentsService
 	Transactions *transactionsService
+	Transfers *transfersService
 }
 
 // New creates and returns a new flutterwave.Client from a slice of flutterwave.ClientOption.
@@ -44,6 +45,7 @@ func New(options ...ClientOption) *Client {
 	client.Bills = (*billsService)(&client.common)
 	client.Payments = (*paymentsService)(&client.common)
 	client.Transactions = (*transactionsService)(&client.common)
+	client.Transfers = (*transfersService)(&client.common)
 	return client
 }
 

internal/stubs/api_responses.go

@@ -88,3 +88,24 @@ func TransactionRefundResponse() []byte {
 }
 `)
 }
+
+// TransferRatesResponse is a dummy response for fetching the tranfer rate of a given transaction.
+func TransferRateResponse() []byte {
+	return []byte(`
+	{
+  "status": "success",
+  "message": "Transfer amount fetched",
+  "data": {
+    "rate": 624.24,
+    "source": {
+      "currency": "NGN",
+      "amount": 624240
+    },
+    "destination": {
+      "currency": "USD",
+      "amount": 1000
+    }
+  }
+}
+	`)
+}

transfers.go

@@ -0,0 +1,18 @@
+package flutterwave
+
+// ExchangeRateResponse is data returned when querying a transaction.
+type TransferRateResponse struct {
+	Status  string `json:"status"`
+	Message string `json:"message"`
+	Data    struct {
+		Rate        float64 `json:"rate"`
+		Source      Payment `json:"source"`
+		Destination Payment `json:"destination"`
+	}
+}
+
+// Payment is data returned for either the source or the destination.
+type Payment struct {
+	Currency string `json:"currency"`
+	Amount   int    `json:"amount"`
+}

transfers_service.go

@@ -0,0 +1,43 @@
+package flutterwave
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"strconv"
+)
+
+// transfersService is the API client for the `/v3/transfers` endpoint
+type transfersService service
+
+// Estimate the Transfer Rate of a transaction
+//
+// API Docs: https://developer.flutterwave.com/reference/check-transfer-rates
+func (service *transfersService) Rate(ctx context.Context, amount int, destination_currency, source_currency string) (*TransferRateResponse, *Response, error) {
+	uri := "/v3/transfers/rates"
+
+	request, err := service.client.newRequest(ctx, http.MethodGet, uri, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// Adding the parameters
+	requestWithParams := service.client.addURLParams(request, map[string]string{
+		"amount": strconv.Itoa(amount),
+		"destination_currency": destination_currency,
+		"source_currency": source_currency,
+	})
+
+	response, err := service.client.do(requestWithParams)
+	if err != nil {
+		return nil, response, err
+	}
+
+	var data TransferRateResponse
+	if err = json.Unmarshal(*response.Body, &data); err != nil {
+		return nil, response, err
+	}
+
+	return &data, response, nil
+
+}

transfers_service_test.go

@@ -0,0 +1,53 @@
+package flutterwave
+
+import (
+	"context"
+	"github.com/NdoleStudio/flutterwave-go/internal/helpers"
+	"github.com/NdoleStudio/flutterwave-go/internal/stubs"
+	"github.com/stretchr/testify/assert"
+	"net/http"
+	"testing"
+)
+
+func TestTransfersService_Rate(t *testing.T) {
+	// Setup
+	t.Parallel()
+
+	// Arrange
+	server := helpers.MakeTestServer(http.StatusOK, string(stubs.TransferRateResponse()))
+	client := New(WithBaseURL(server.URL))
+
+	// Act
+	rate, response, err := client.Transfers.Rate(context.Background(), 1000, "USD", "NGN")
+
+	// Assert
+	assert.Nil(t, err)
+
+	assert.Equal(t, http.StatusOK, response.HTTPResponse.StatusCode)
+	assert.Equal(t, stubs.TransferRateResponse(), *response.Body)
+	assert.Equal(t, 624240, rate.Data.Source.Amount)
+
+	// Teardown
+	server.Close()
+}
+
+func TestTransfersService_Rate_Failure(t *testing.T) {
+	// Setup
+	t.Parallel()
+
+	// Arrange
+	server := helpers.MakeTestServer(http.StatusInternalServerError, `{"error": "internal server error"}`)
+	client := New(WithBaseURL(server.URL))
+
+	// Act
+	rate, response, err := client.Transfers.Rate(context.Background(), 1000, "USD", "NGN")
+
+	// Assert
+	assert.NotNil(t, err) // Expect an error
+	assert.Nil(t, rate)   // The rate should be nil due to failure
+	assert.Equal(t, http.StatusInternalServerError, response.HTTPResponse.StatusCode)
+	assert.Contains(t, err.Error(), "500") // Ensure error message contains 500
+
+	// Teardown
+	server.Close()
+}