Respected accessibility of premium for credits purchasing.

Telegram/Resources/langs/lang.strings

@@ -2328,6 +2328,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_credits_small_balance_title#one" = "{count} Star Needed";
 "lng_credits_small_balance_title#other" = "{count} Stars Needed";
 "lng_credits_small_balance_about" = "Buy **Stars** and use them on **{bot}** and other miniapps.";
+"lng_credits_purchase_blocked" = "Sorry, you can't purchase this item with Telegram Stars.";
 
 "lng_location_title" = "Location";
 "lng_location_about" = "Display the location of your business on your account.";

Telegram/SourceFiles/payments/payments_non_panel_process.cpp

@@ -15,6 +15,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_user.h"
 #include "history/history_item.h"
 #include "history/history_item_components.h"
+#include "lang/lang_keys.h"
 #include "main/main_session.h"
 #include "mainwidget.h"
 #include "payments/payments_checkout_process.h" // NonPanelPaymentForm.
@@ -80,13 +81,19 @@ Fn<void(NonPanelPaymentForm)> ProcessNonPanelPaymentFormFactory(
 						- int64(slice.balance);
 					if (creditsNeeded <= 0) {
 						sendBox();
-					} else {
+					} else if (strong->session().premiumPossible()) {
 						strong->uiShow()->show(Box(
 							Settings::SmallBalanceBox,
 							strong,
 							creditsNeeded,
 							form->botId,
 							sendBox));
+					} else {
+						strong->uiShow()->showToast(
+							tr::lng_credits_purchase_blocked(tr::now));
+						if (maybeReturnToBot) {
+							maybeReturnToBot(CheckoutResult::Failed);
+						}
 					}
 				}
 				lifetime->destroy();

Telegram/SourceFiles/settings/settings_credits_graphics.cpp

@@ -286,11 +286,20 @@ void FillCreditOptions(
 	const auto apiCredits = content->lifetime().make_state<ApiOptions>(
 		controller->session().user());
 
-	apiCredits->request(
-	) | rpl::start_with_error_done([=](const QString &error) {
-		controller->showToast(error);
-	}, [=] {
-		fill(apiCredits->options());
+	if (controller->session().premiumPossible()) {
+		apiCredits->request(
+		) | rpl::start_with_error_done([=](const QString &error) {
+			controller->showToast(error);
+		}, [=] {
+			fill(apiCredits->options());
+		}, content->lifetime());
+	}
+
+	controller->session().premiumPossibleValue(
+	) | rpl::start_with_next([=](bool premiumPossible) {
+		if (!premiumPossible) {
+			fill({});
+		}
 	}, content->lifetime());
 }