How to log in to qiwi api?

Question

PHP

Greetings, Qiwi payment in the online store based on lazy pay has stopped working.
Through simple manipulations, I found an error, when sending a POST request to https://auth.qiwi.com/cas/tgts , the following result is returned

Array
(
    [entity] => Array
        (
            [user] => +тут_номер_телефона
            [error] => Array
                (
                    [code] => 1
                    [message] => Докажите, что вы не робот.
                )
        )
    [links] => Array
        (
            [0] => Array
                (
                    [rel] => self
                    [href] => https://auth.qiwi.com/cas/tgts
                )

            [1] => Array
                (
                    [rel] => captcha
                    [href] => https://auth.qiwi.com/captcha
                )
        )
)

I must say right away that the store is not mine, I'm just a freelancer who got such a job
The customer claims that until yesterday the payment worked fine, which I strongly doubt