add payment example

examples/payment/main.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"os/signal"
+
+	"github.com/go-telegram/bot"
+	"github.com/go-telegram/bot/models"
+)
+
+// Payments example
+
+// 1. Add payment method for your bot in BotFather. For example, use Test provider Paymaster.
+// 2. Store provider token in environment variable EXAMPLE_TELEGRAM_PAYMENT_TOKEN.
+// 3. Start the bot and send /payment command to the bot.
+// 4. Click on the payment button in the chat.
+// 5. Enter test card data: 5185730450000003, 01/30, 123 (see test cards in https://developer.mastercard.com/mastercard-merchant-presented-qr/documentation/server-apis/test-card-numbers/)
+// 6. Click on the Pay button.
+
+// See https://core.telegram.org/bots/payments#step-by-step-process for details
+
+func main() {
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
+	defer cancel()
+
+	opts := []bot.Option{
+		bot.WithDefaultHandler(handler),
+		bot.WithMessageTextHandler("/payment", bot.MatchTypeExact, handlerPaymentCommand),
+	}
+
+	b, _ := bot.New(os.Getenv("EXAMPLE_TELEGRAM_BOT_TOKEN"), opts...)
+
+	b.Start(ctx)
+}
+
+func handlerPaymentCommand(ctx context.Context, b *bot.Bot, update *models.Update) {
+	_, err := b.SendInvoice(ctx, &bot.SendInvoiceParams{
+		ChatID:          update.Message.Chat.ID,
+		MessageThreadID: 0,
+		Title:           "Invoice Title",
+		Description:     "Invoice description",
+		Payload:         "xxx",
+		ProviderToken:   os.Getenv("EXAMPLE_TELEGRAM_PAYMENT_TOKEN"),
+		Currency:        "RUB",
+		Prices: []models.LabeledPrice{
+			{Label: "Price 1", Amount: 12425},
+			{Label: "Price 2", Amount: 32454},
+		},
+	})
+	if err != nil {
+		fmt.Printf("error sending invoice: %s\n", err)
+	}
+}
+
+func handler(ctx context.Context, b *bot.Bot, update *models.Update) {
+	if update.PreCheckoutQuery != nil {
+		fmt.Printf("get PreCheckoutQuery for invoce payload: %s\n", update.PreCheckoutQuery.InvoicePayload)
+
+		b.AnswerPreCheckoutQuery(ctx, &bot.AnswerPreCheckoutQueryParams{
+			PreCheckoutQueryID: update.PreCheckoutQuery.ID,
+			OK:                 true,
+			ErrorMessage:       "",
+		})
+		return
+	}
+
+	if update.Message != nil {
+		if update.Message.SuccessfulPayment != nil {
+			b.SendMessage(ctx, &bot.SendMessageParams{
+				ChatID:    update.Message.Chat.ID,
+				Text:      fmt.Sprintf("Payment was successful with payment payload: *%s*", update.Message.SuccessfulPayment.InvoicePayload),
+				ParseMode: models.ParseModeMarkdown,
+			})
+			return
+		}
+	}
+}