Improve post-purchase message

bot/keyboards/inline/user_keyboards.py

@@ -185,3 +185,41 @@ def get_user_banned_keyboard(support_link: Optional[str], lang: str,
     builder = InlineKeyboardBuilder()
     builder.button(text=_(key="menu_support_button"), url=support_link)
     return builder.as_markup()
+
+
+def get_connect_and_main_keyboard(
+        lang: str,
+        i18n_instance,
+        settings: Settings,
+        config_link: Optional[str]) -> InlineKeyboardMarkup:
+    """Keyboard with a connect button and a back to main menu button."""
+    _ = lambda key, **kwargs: i18n_instance.gettext(lang, key, **kwargs)
+    builder = InlineKeyboardBuilder()
+
+    if settings.SUBSCRIPTION_MINI_APP_URL:
+        builder.row(
+            InlineKeyboardButton(
+                text=_("connect_button"),
+                web_app=WebAppInfo(url=settings.SUBSCRIPTION_MINI_APP_URL),
+            )
+        )
+    elif config_link:
+        builder.row(
+            InlineKeyboardButton(text=_("connect_button"), url=config_link)
+        )
+    else:
+        builder.row(
+            InlineKeyboardButton(
+                text=_("connect_button"),
+                callback_data="main_action:my_subscription",
+            )
+        )
+
+    builder.row(
+        InlineKeyboardButton(
+            text=_("back_to_main_menu_button"),
+            callback_data="main_action:back_to_main",
+        )
+    )
+
+    return builder.as_markup()