Qiwi API -> Json validation error Why such an answer?

Question

API

Hey!
Qiwi gives such a response when transferring funds to another qiwi through the API, not to be confused with the Cashier.

array(1) {
  ["message"]=>
  string(108) "Json validation error List((obj.id,List(JsonValidationError(List(error.expected.jsstring),WrappedArray()))))"
}

Why?
Yesterday it worked, but today it's like this. There are no restrictions, the SB unsubscribed.
Thank you!