There have been instances where certain transactions are being declined during the anti-fraud analysis due to the null value in the minicart.buyer.id field. Thus, the minicart.buyer.id is expected to be sent from the checkout to the gateway through sendAdditionalData. However, according to the current checkout architecture, there is no specific requirement to provide this field in sendAdditionalData, and its definition may or may not be available at a later stage.

It's not possible to reproduce this behavior once this is intermittent.

It is possible to send the additional data afterward through our API: https://developers.vtex.com/docs/api-reference/payments-gateway-api#post-/api/pvt/transactions/-transactionId-/additional-data