Go Examples

Illustrative Go examples for integrating with the LuxCore API using the standard library.

LuxCore Client Package

Save this API v1 package as luxcore/client.go in your Go module. Replace your-project/luxcore in the examples with your module import path.

package luxcore

import (
	"bytes"
	"crypto/hmac"
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"io"
	"math"
	"net/http"
	"net/url"
	"os"
	"time"
)

const BaseURL = "https://api.lux-core.io/api/v1"

type Client struct {
	APIKey     string
	HTTPClient *http.Client
	BaseURL    string
}

type LuxCoreError struct {
	Message    string
	StatusCode int
	ErrorCode  string
}

func (e *LuxCoreError) Error() string {
	return fmt.Sprintf("LuxCore API error (%d): %s", e.StatusCode, e.Message)
}

func NewClient(apiKey string) *Client {
	if apiKey == "" {
		apiKey = os.Getenv("LUXCORE_API_KEY")
	}
	return &Client{
		APIKey:     apiKey,
		HTTPClient: &http.Client{Timeout: 30 * time.Second},
		BaseURL:    BaseURL,
	}
}

func (c *Client) request(method, path string, body interface{}, params url.Values) ([]byte, error) {
	reqURL := c.BaseURL + path
	if params != nil {
		reqURL += "?" + params.Encode()
	}

	var reqBody io.Reader
	if body != nil {
		jsonBody, err := json.Marshal(body)
		if err != nil {
			return nil, err
		}
		reqBody = bytes.NewBuffer(jsonBody)
	}

	req, err := http.NewRequest(method, reqURL, reqBody)
	if err != nil {
		return nil, err
	}

	req.Header.Set("X-API-Key", c.APIKey)
	req.Header.Set("Content-Type", "application/json")

	resp, err := c.HTTPClient.Do(req)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	respBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}

	if resp.StatusCode >= 400 {
		var errResp struct {
			Message string `json:"message"`
			Error   string `json:"error"`
			ErrorCode string `json:"error_code"`
		}
		json.Unmarshal(respBody, &errResp)
		return nil, &LuxCoreError{
			Message:    errResp.Message,
			StatusCode: resp.StatusCode,
			ErrorCode:  errResp.ErrorCode,
		}
	}

	return respBody, nil
}

// Payment types
type PaymentRequest struct {
	Amount            int64                  `json:"amount"`
	Currency          string                 `json:"currency"`
	Method            string                 `json:"method"`
	Type              string                 `json:"type"`
	MerchantReference string                 `json:"merchant_reference"`
	Description       string                 `json:"description,omitempty"`
	Customer          Customer               `json:"customer"`
	Payout            *PayoutDetails         `json:"payout,omitempty"`
	Metadata          map[string]interface{} `json:"metadata,omitempty"`
}

type Customer struct {
	Name       string `json:"name"`
	Email      string `json:"email"`
	Phone      string `json:"phone,omitempty"`
	ExternalID string `json:"external_id,omitempty"`
}

type PayoutDetails struct {
	RecipientName    string `json:"recipient_name"`
	BankAccount      string `json:"bank_account"`
	BankCode         string `json:"bank_code"`
	Reference        string `json:"reference,omitempty"`
	AccountType      string `json:"account_type,omitempty"`
	BeneficiaryTaxID string `json:"beneficiary_tax_id,omitempty"`
	Description      string `json:"description,omitempty"`
	PayID     string `json:"payid,omitempty"`
	PayIDType string `json:"payid_type,omitempty"`
}

type Payment struct {
	ID                string                 `json:"id,omitempty"` // Lookup response identifier
	TransactionID     string                 `json:"transaction_id"`
	Status            string                 `json:"status"`
	Amount            int64                  `json:"amount"`
	Currency          string                 `json:"currency"`
	Method            *string                `json:"method"`
	Type              string                 `json:"type"`
	MerchantReference string                 `json:"merchant_reference"`
	FeeAmount         *int64                 `json:"fee_amount,omitempty"`
	NetAmount         *int64                 `json:"net_amount,omitempty"`
	ErrorCode         string                 `json:"error_code,omitempty"`
	ErrorMessage      string                 `json:"error_message,omitempty"`
	CreatedAt         time.Time              `json:"created_at"`
	BankDetails       *BankDetails           `json:"bank_details,omitempty"`
	Metadata          map[string]interface{} `json:"metadata,omitempty"`
}

type BankDetails struct {
	Amount        string  `json:"amount"`
	Purpose       string  `json:"purpose"`
	Currency      string  `json:"currency"`
	BankName      string  `json:"bank_name"`
	SwiftCode     *string `json:"swift_code"`
	AccountHolder string  `json:"account_holder"`
	AccountNumber string  `json:"account_number"`
}

type PaymentListResponse struct {
	Success    bool       `json:"success"`
	Data       []Payment  `json:"data"`
	Total      int        `json:"total"`
	Pagination *Pagination `json:"pagination,omitempty"`
}

type Pagination struct {
	Limit      int `json:"limit"`
	Offset     int `json:"offset"`
	TotalPages int `json:"total_pages"`
}

// Payment methods
func (c *Client) CreatePayment(req PaymentRequest) (*Payment, error) {
	respBody, err := c.request("POST", "/payments", req, nil)
	if err != nil {
		return nil, err
	}

	var payment Payment
	if err := json.Unmarshal(respBody, &payment); err != nil {
		return nil, err
	}

	return &payment, nil
}

func (c *Client) GetPayment(paymentID string) (*Payment, error) {
	respBody, err := c.request("GET", "/payments/"+paymentID, nil, nil)
	if err != nil {
		return nil, err
	}

	var payment Payment
	if err := json.Unmarshal(respBody, &payment); err != nil {
		return nil, err
	}

	return &payment, nil
}

func (c *Client) ListPayments(filters map[string]string) (*PaymentListResponse, error) {
	params := url.Values{}
	for k, v := range filters {
		params.Set(k, v)
	}

	respBody, err := c.request("GET", "/payments", nil, params)
	if err != nil {
		return nil, err
	}

	var result PaymentListResponse
	if err := json.Unmarshal(respBody, &result); err != nil {
		return nil, err
	}

	return &result, nil
}

func (c *Client) CancelPayment(paymentID string) error {
	_, err := c.request("POST", "/payments/"+paymentID+"/cancel", nil, nil)
	return err
}

// Balance
type BalanceResponse struct {
	Success          bool   `json:"success"`
	MerchantID       int    `json:"merchant_id"`
	Currency         string `json:"currency"`
	BalanceType      string `json:"balance_type"`
	BalanceAmount    int64 `json:"balance_amount"`
	AvailableAmount  int64 `json:"available_amount"`
	FrozenAmount     int64 `json:"frozen_amount"`
	NewBalance       int    `json:"new_balance"`
	AvailableBalance int    `json:"available_balance"`
}

func (c *Client) GetBalance(currency string) (*BalanceResponse, error) {
	params := url.Values{}
	params.Set("balance_type", "main")
	if currency != "" {
		params.Set("currency", currency)
	}

	respBody, err := c.request("GET", "/balance", nil, params)
	if err != nil {
		return nil, err
	}

	var balance BalanceResponse
	if err := json.Unmarshal(respBody, &balance); err != nil {
		return nil, err
	}

	return &balance, nil
}

// Webhook verification
func VerifyWebhookSignature(payload []byte, signature string, timestamp int64, secret string) error {
	// Check timestamp (reject if older than 5 minutes)
	currentTime := time.Now().Unix()
	if math.Abs(float64(currentTime-timestamp)) > 300 {
		return fmt.Errorf("webhook timestamp too old")
	}

	// Calculate expected signature
	payloadToSign := fmt.Sprintf("%d.%s", timestamp, string(payload))
	mac := hmac.New(sha256.New, []byte(secret))
	mac.Write([]byte(payloadToSign))
	expectedSignature := "hmac_sha256=" + hex.EncodeToString(mac.Sum(nil))

	// Compare signatures
	if !hmac.Equal([]byte(signature), []byte(expectedSignature)) {
		return fmt.Errorf("invalid webhook signature")
	}

	return nil
}

The webhook helpers below use the default HMAC-SHA256 algorithm. Use the configured algorithm and verify a test delivery before enabling business actions. These examples are clients for API v1, not official SDK packages.

Usage Examples

Create a Deposit Payment

package main

import (
	"fmt"
	"log"
	"time"

	"your-project/luxcore"
)

func main() {
	client := luxcore.NewClient("")

	payment, err := client.CreatePayment(luxcore.PaymentRequest{
		Amount:            100000, // $1,000.00 MXN (in centavos)
		Currency:          "MXN",
		Method:            "spei",
		Type:              "deposit",
		MerchantReference: fmt.Sprintf("order_%d", time.Now().Unix()),
		Customer: luxcore.Customer{
			Name:  "Juan Perez",
			Email: "juan@example.com",
			Phone: "+525551234567",
		},
		Metadata: map[string]interface{}{
			"order_id": "12345",
			"source":   "web",
		},
	})
	if err != nil {
		log.Fatalf("Failed to create payment: %v", err)
	}

	fmt.Printf("Payment created: %s\n", payment.TransactionID)
	fmt.Printf("Status: %s\n", payment.Status)

	if payment.BankDetails != nil {
		fmt.Printf("Bank: %s\n", payment.BankDetails.BankName)
		fmt.Printf("Account: %s\n", payment.BankDetails.AccountNumber)
		fmt.Printf("Holder: %s\n", payment.BankDetails.AccountHolder)
	}
}

Create a Withdrawal (Payout)

payout, err := client.CreatePayment(luxcore.PaymentRequest{
	Amount:            50000,
	Currency:          "MXN",
	Method:            "spei",
	Type:              "withdrawal",
	MerchantReference: fmt.Sprintf("payout_%d", time.Now().Unix()),
	Customer: luxcore.Customer{
		Name:  "Finance Team",
		Email: "finance@company.com",
	},
	Payout: &luxcore.PayoutDetails{
		RecipientName: "Maria Garcia",
		BankAccount:   "012345678901234567",
		BankCode:      "002",
		Reference:     "PAYOUT-001",
	},
})
if err != nil {
	log.Fatal(err)
}

fmt.Printf("Payout created: %s\n", payout.TransactionID)

Webhook Handler (net/http)

package main

import (
	"encoding/json"
	"io"
	"log"
	"net/http"
	"os"
	"strconv"

	"your-project/luxcore"
)

var webhookSecret = os.Getenv("LUXCORE_WEBHOOK_SECRET")

// WebhookPayload uses the envelope structure
type WebhookPayload struct {
	ID         string      `json:"id"`
	CreatedAt  string      `json:"created_at"`
	MerchantID string      `json:"merchant_id"`
	Data       WebhookData `json:"data"`
}

type WebhookData struct {
	Payment json.RawMessage `json:"payment"`
}

func webhookHandler(w http.ResponseWriter, r *http.Request) {
	// Read body
	body, err := io.ReadAll(r.Body)
	if err != nil {
		http.Error(w, "Failed to read body", http.StatusBadRequest)
		return
	}

	// Get headers
	signature := r.Header.Get("X-Webhook-Signature")
	timestampStr := r.Header.Get("X-Webhook-Timestamp")
	timestamp, _ := strconv.ParseInt(timestampStr, 10, 64)
	webhookId := r.Header.Get("X-Webhook-Id")

	// Verify signature
	if err := luxcore.VerifyWebhookSignature(body, signature, timestamp, webhookSecret); err != nil {
		log.Printf("Webhook verification failed: %v", err)
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	// Parse payload (envelope structure)
	var payload WebhookPayload
	if err := json.Unmarshal(body, &payload); err != nil {
		http.Error(w, "Invalid JSON", http.StatusBadRequest)
		return
	}

	if r.Header.Get("X-Webhook-Test") == "true" || len(payload.Data.Payment) == 0 {
		w.WriteHeader(http.StatusOK)
		return
	}
	var payment struct { ID string `json:"id"`; Status string `json:"status"` }
	if err := json.Unmarshal(payload.Data.Payment, &payment); err != nil {
		http.Error(w, "Invalid payment", http.StatusBadRequest)
		return
	}
	event := "payment." + payment.Status
	// Persist/deduplicate payload.ID before applying business effects.
	log.Printf("Received webhook event: %s (id: %s)", event, webhookId)

	switch event {
	case "payment.completed":
		log.Println("Payment completed!")
		// Handle completed payment
	case "payment.failed":
		log.Println("Payment failed!")
		// Handle failed payment
	case "payment.cancelled":
		log.Println("Payment cancelled!")
		// Handle cancelled payment
	default:
		log.Printf("Unhandled event: %s", event)
	}

	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusOK)
	json.NewEncoder(w).Encode(map[string]bool{"received": true})
}

func main() {
	http.HandleFunc("/webhooks/luxcore", webhookHandler)
	log.Println("Starting webhook server on :3000")
	log.Fatal(http.ListenAndServe(":3000", nil))
}

Error Handling

payment, err := client.CreatePayment(req)
if err != nil {
	if luxErr, ok := err.(*luxcore.LuxCoreError); ok {
		switch luxErr.StatusCode {
		case 401:
			log.Println("Invalid API key")
		case 400:
			log.Printf("Validation error: %s", luxErr.Message)
		case 429:
			log.Println("Rate limited - inspect Retry-After and verify the original payment outcome")
			time.Sleep(60 * time.Second)
			// Do not replay an uncertain payment creation; inspect its original outcome first.
		case 500, 503:
			log.Println("Verify the original payment outcome before creating a replacement")
			// Preserve merchant reference; check the original outcome or contact support.
		default:
			log.Printf("API error (%d): %s", luxErr.StatusCode, luxErr.Message)
		}
	} else {
		log.Printf("Network error: %v", err)
	}
	return
}

Complete Example with Gin

package main

import (
	"log"
	"net/http"
	"os"

	"github.com/gin-gonic/gin"
	"your-project/luxcore"
)

var client *luxcore.Client

func main() {
	client = luxcore.NewClient(os.Getenv("LUXCORE_API_KEY"))

	r := gin.Default()

	// Create payment endpoint
	r.POST("/api/payments", createPaymentHandler)

	// Webhook endpoint
	r.POST("/webhooks/luxcore", webhookHandler)

	r.Run(":8080")
}

func createPaymentHandler(c *gin.Context) {
	var req struct {
		Amount   int64  `json:"amount" binding:"required"`
		OrderID  string `json:"order_id" binding:"required"`
		Customer struct {
			Name  string `json:"name" binding:"required"`
			Email string `json:"email" binding:"required"`
		} `json:"customer" binding:"required"`
	}

	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	payment, err := client.CreatePayment(luxcore.PaymentRequest{
		Amount:            req.Amount,
		Currency:          "MXN",
		Method:            "spei",
		Type:              "deposit",
		MerchantReference: req.OrderID,
		Customer: luxcore.Customer{
			Name:  req.Customer.Name,
			Email: req.Customer.Email,
		},
	})
	if err != nil {
		if luxErr, ok := err.(*luxcore.LuxCoreError); ok {
			c.JSON(luxErr.StatusCode, gin.H{"error": luxErr.Message})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Payment creation failed"})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"payment_id":   payment.TransactionID,
		"status":       payment.Status,
		"bank_details": payment.BankDetails,
	})
}

Getting Started

Guides

SDKs & Examples

Reference

Go Examples

Go Examples

LuxCore Client Package

Usage Examples

Create a Deposit Payment

Create a Withdrawal (Payout)

Webhook Handler (net/http)

Error Handling

Complete Example with Gin

​Go Examples

​LuxCore Client Package

​Usage Examples

​Create a Deposit Payment

​Create a Withdrawal (Payout)

​Webhook Handler (net/http)

​Error Handling

​Complete Example with Gin

Go Examples

LuxCore Client Package

Usage Examples

Create a Deposit Payment

Create a Withdrawal (Payout)

Webhook Handler (net/http)

Error Handling

Complete Example with Gin