Telegex.answer_pre_checkout_query

You're seeing just the function answer_pre_checkout_query, go back to Telegex module for more information.
Link to this function

answer_pre_checkout_query(pre_checkout_query_id, ok, optionals \\ [])

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Specs

answer_pre_checkout_query(String.t(), boolean(), [{:error_message, String.t()}]) ::
  {:ok, boolean()} | {:error, Telegex.Model.errors()}

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