добавлен биллинг и тарифы

добавлена интеграция с юкасса

internal/infrastructure/yookassa/client.go

@@ -0,0 +1,79 @@
+package yookassa
+
+import (
+	"bytes"
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/shopspring/decimal"
+)
+
+type Client struct {
+	shopID     string
+	secretKey  string
+	baseURL    string
+	httpClient *http.Client
+}
+
+func NewClient(shopID, secretKey string) *Client {
+	return &Client{
+		shopID:     shopID,
+		secretKey:  secretKey,
+		baseURL:    "https://api.yookassa.ru/v3",
+		httpClient: &http.Client{Timeout: 15 * time.Second},
+	}
+}
+
+func (c *Client) CreatePayment(ctx context.Context, amount decimal.Decimal, description string, orderID uuid.UUID, returnURL string) (*PaymentResponse, error) {
+	reqBody := PaymentRequest{
+		Amount: Amount{
+			Value:    amount.StringFixed(2),
+			Currency: "RUB",
+		},
+		Capture: true, // Автоматическое списание
+		Confirmation: Confirmation{
+			Type:      "redirect",
+			ReturnURL: returnURL,
+		},
+		Metadata: map[string]string{
+			"order_id": orderID.String(),
+		},
+		Description: description,
+	}
+
+	body, _ := json.Marshal(reqBody)
+	req, err := http.NewRequestWithContext(ctx, "POST", c.baseURL+"/payments", bytes.NewReader(body))
+	if err != nil {
+		return nil, err
+	}
+
+	// Basic Auth
+	auth := base64.StdEncoding.EncodeToString([]byte(c.shopID + ":" + c.secretKey))
+	req.Header.Set("Authorization", "Basic "+auth)
+	req.Header.Set("Content-Type", "application/json")
+
+	// Идемпотентность: используем наш order_id как ключ
+	req.Header.Set("Idempotence-Key", orderID.String())
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("yookassa error: status %d", resp.StatusCode)
+	}
+
+	var result PaymentResponse
+	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return nil, err
+	}
+
+	return &result, nil
+}