Show real subscription price from the API.

Telegram/SourceFiles/api/api_premium.cpp

@@ -35,6 +35,14 @@ rpl::producer<TextWithEntities> Premium::statusTextValue() const {
 		_statusText.value_or(TextWithEntities()));
 }
 
+int64 Premium::monthlyAmount() const {
+	return _monthlyAmount;
+}
+
+QString Premium::monthlyCurrency() const {
+	return _monthlyCurrency;
+}
+
 void Premium::reload() {
 	if (_statusRequestId) {
 		return;
@@ -43,6 +51,8 @@ void Premium::reload() {
 	)).done([=](const MTPhelp_PremiumPromo &result) {
 		_statusRequestId = 0;
 		result.match([&](const MTPDhelp_premiumPromo &data) {
+			_monthlyAmount = data.vmonthly_amount().v;
+			_monthlyCurrency = qs(data.vcurrency());
 			auto text = TextWithEntities{
 				qs(data.vstatus_text()),
 				EntitiesFromMTP(_session, data.vstatus_entities().v),

Telegram/SourceFiles/api/api_premium.h

@@ -24,6 +24,9 @@ public:
 	void reload();
 	[[nodiscard]] rpl::producer<TextWithEntities> statusTextValue() const;
 
+	[[nodiscard]] int64 monthlyAmount() const;
+	[[nodiscard]] QString monthlyCurrency() const;
+
 private:
 	const not_null<Main::Session*> _session;
 	MTP::Sender _api;
@@ -32,6 +35,9 @@ private:
 	std::optional<TextWithEntities> _statusText;
 	rpl::event_stream<TextWithEntities> _statusTextUpdates;
 
+	int64 _monthlyAmount = 0;
+	QString _monthlyCurrency;
+
 };
 
 } // namespace Api

Telegram/SourceFiles/settings/settings_main.cpp

@@ -559,9 +559,7 @@ Main::Main(
 : Section(parent)
 , _controller(controller) {
 	setupContent(controller);
-	if (_controller->session().premium()) {
-		_controller->session().api().premium().reload();
-	}
+	_controller->session().api().premium().reload();
 }
 
 rpl::producer<QString> Main::title() {

Telegram/SourceFiles/settings/settings_premium.cpp

@@ -22,6 +22,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/effects/gradient.h"
 #include "ui/effects/premium_graphics.h"
 #include "ui/text/text_utilities.h"
+#include "ui/text/format_values.h"
 #include "ui/widgets/gradient_round_button.h"
 #include "ui/widgets/labels.h"
 #include "ui/wrap/fade_wrap.h"
@@ -166,6 +167,7 @@ using Order = std::vector<QString>;
 }
 
 [[nodiscard]] not_null<Ui::RpWidget*> CreateSubscribeButton(
+		not_null<Window::SessionController*> controller,
 		not_null<Ui::RpWidget*> parent,
 		Fn<void()> callback) {
 	const auto result = Ui::CreateChild<Ui::GradientButton>(
@@ -177,9 +179,21 @@ using Order = std::vector<QString>;
 	const auto &st = st::premiumPreviewBox.button;
 	result->resize(parent->width(), st.height);
 
+	const auto premium = &controller->session().api().premium();
+	const auto computeCost = [=] {
+		const auto amount = premium->monthlyAmount();
+		const auto currency = premium->monthlyCurrency();
+		const auto valid = (amount > 0) && !currency.isEmpty();
+		return Ui::FillAmountAndCurrency(
+			valid ? amount : 500,
+			valid ? currency : "USD");
+	};
+
 	const auto label = Ui::CreateChild<Ui::FlatLabel>(
 		result,
-		tr::lng_premium_summary_button(tr::now, lt_cost, "$5"),
+		tr::lng_premium_summary_button(
+			lt_cost,
+			premium->statusTextValue() | rpl::map(computeCost)),
 		st::premiumPreviewButtonLabel);
 	label->setAttribute(Qt::WA_TransparentForMouseEvents);
 	rpl::combine(
@@ -878,7 +892,7 @@ QPointer<Ui::RpWidget> Premium::createPinnedToBottom(
 		not_null<Ui::RpWidget*> parent) {
 	const auto content = Ui::CreateChild<Ui::RpWidget>(parent.get());
 
-	const auto button = CreateSubscribeButton(content, [=] {
+	const auto button = CreateSubscribeButton(_controller, content, [=] {
 		SendScreenAccept(_controller);
 		StartPremiumPayment(_controller, _ref);
 	});