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src/api/miniapp.ts

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+export interface MiniappCreatePaymentPayload {
+  initData: string
+  method: string
+  amountKopeks?: number | null
+  option?: string | null
+}
+
+export interface MiniappCreatePaymentResponse {
+  payment_url: string
+  amount_kopeks?: number
+  extra?: Record<string, unknown>
+}
+
+export const miniappApi = {
+  // Create payment inside Telegram Mini App (same flow as miniapp/index.html)
+  createPayment: async (
+    payload: MiniappCreatePaymentPayload
+  ): Promise<MiniappCreatePaymentResponse> => {
+    const res = await fetch('/miniapp/payments/create', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({
+        initData: payload.initData || '',
+        method: payload.method,
+        amountKopeks: payload.amountKopeks ?? null,
+        option: payload.option ?? null,
+      }),
+    })
+    const data = await res.json().catch(() => ({}))
+    if (!res.ok) {
+      const message = (data && (data.detail || data.message)) || 'Failed to create payment'
+      throw new Error(String(message))
+    }
+    return data as MiniappCreatePaymentResponse
+  },
+}