answerPreCheckoutQuery

Once the user has confirmed their payment and shipping details, the Bot API sends the final confirmation in the form of an Update with the field pre_checkout_query
Use this method to respond to such pre-checkout queries
Note: The Bot API must receive an answer within 10 seconds after the pre-checkout query was sent.

Parameters for answer-pre-checkout-query
Field Description
pre_checkout_query_id * Unique identifier for the query to be answered
ok * Specify True if everything is alright (goods are available, etc.) and the bot is ready to proceed with the order
Use False if there are any problems.
error_message Required if ok is False
Error message in human readable form that explains the reason for failure to proceed with the checkout (e.g
"Sorry, somebody just bought the last of our amazing black T-shirts while you were busy filling out your payment details
Please choose a different color or garment!")
Telegram will display this message to the user.