This question has already been answered:
There is a need to make a custom keyboard with numbers in order for the user to enter a number, for example, 900.
But here I ran into another problem, if the user starts entering this number, then in fact it will be sent in the form of three messages - "9", "0", "0".
Is it possible not to send a message while the user enters data, and by pressing the additional buttons (for example, to make Enter) to send everything in one message?