Add td_api::canPurchasePremium.

td/generate/scheme/td_api.tl

@@ -6403,6 +6403,9 @@ clickPremiumSubscriptionButton = Ok;
 //@description Returns state of Telegram Premium subscription and promotion videos for Premium features
 getPremiumState = PremiumState;
 
+//@description Checks whether Telegram Premium purchase is possible. Must be called before in-store Premium purchase
+canPurchasePremium = Ok;
+
 
 //@description Accepts Telegram terms of services @terms_of_service_id Terms of service identifier
 acceptTermsOfService terms_of_service_id:string = Ok;

td/telegram/Premium.cpp

@@ -138,6 +138,35 @@ class GetPremiumPromoQuery final : public Td::ResultHandler {
   }
 };
 
+class CanPurchasePremiumQuery final : public Td::ResultHandler {
+  Promise<Unit> promise_;
+
+ public:
+  explicit CanPurchasePremiumQuery(Promise<Unit> &&promise) : promise_(std::move(promise)) {
+  }
+
+  void send() {
+    send_query(G()->net_query_creator().create(telegram_api::payments_canPurchasePremium()));
+  }
+
+  void on_result(BufferSlice packet) final {
+    auto result_ptr = fetch_result<telegram_api::payments_canPurchasePremium>(packet);
+    if (result_ptr.is_error()) {
+      return on_error(result_ptr.move_as_error());
+    }
+
+    bool result = result_ptr.ok();
+    if (result) {
+      return promise_.set_value(Unit());
+    }
+    on_error(Status::Error(400, "Premium can't be purchased"));
+  }
+
+  void on_error(Status status) final {
+    promise_.set_error(std::move(status));
+  }
+};
+
 const vector<Slice> &get_premium_limit_keys() {
   static const vector<Slice> limit_keys{"channels",
                                         "saved_gifs",
@@ -377,4 +406,8 @@ void get_premium_state(Td *td, Promise<td_api::object_ptr<td_api::premiumState>>
   td->create_handler<GetPremiumPromoQuery>(std::move(promise))->send();
 }
 
+void can_purchase_premium(Td *td, Promise<Unit> &&promise) {
+  td->create_handler<CanPurchasePremiumQuery>(std::move(promise))->send();
+}
+
 }  // namespace td

td/telegram/Premium.h

@@ -31,4 +31,6 @@ void click_premium_subscription_button(Td *td, Promise<Unit> &&promise);
 
 void get_premium_state(Td *td, Promise<td_api::object_ptr<td_api::premiumState>> &&promise);
 
+void can_purchase_premium(Td *td, Promise<Unit> &&promise);
+
 }  // namespace td

td/telegram/Td.cpp

@@ -7892,6 +7892,12 @@ void Td::on_request(uint64 id, const td_api::getPremiumState &request) {
   get_premium_state(this, std::move(promise));
 }
 
+void Td::on_request(uint64 id, const td_api::canPurchasePremium &request) {
+  CHECK_IS_USER();
+  CREATE_OK_REQUEST_PROMISE();
+  can_purchase_premium(this, std::move(promise));
+}
+
 void Td::on_request(uint64 id, td_api::acceptTermsOfService &request) {
   CHECK_IS_USER();
   CLEAN_INPUT_STRING(request.terms_of_service_id_);

td/telegram/Td.h

@@ -1307,6 +1307,8 @@ class Td final : public Actor {
 
   void on_request(uint64 id, const td_api::getPremiumState &request);
 
+  void on_request(uint64 id, const td_api::canPurchasePremium &request);
+
   void on_request(uint64 id, td_api::acceptTermsOfService &request);
 
   void on_request(uint64 id, const td_api::getCountries &request);

td/telegram/cli.cpp

@@ -2572,6 +2572,8 @@ class CliClient final : public Actor {
       send_request(td_api::make_object<td_api::clickPremiumSubscriptionButton>());
     } else if (op == "gprs") {
       send_request(td_api::make_object<td_api::getPremiumState>());
+    } else if (op == "cppr") {
+      send_request(td_api::make_object<td_api::canPurchasePremium>());
     } else if (op == "atos") {
       send_request(td_api::make_object<td_api::acceptTermsOfService>(args));
     } else if (op == "gdli") {