pay method
Adds a pay button to the current row.
Parameters:
text: The text to display on the button
Example:
menu.pay('Pay Now');
Implementation
InlineMenu<CTX> pay(String text) {
_ensureCurrentRow();
final button = InlineKeyboardButton(text: text, pay: true);
_rows.last.add(_InlineMenuItemStatic(_InlineMenuStaticButton(button)));
return this;
}