Can't purchase business version

Hi! I tried to pay business version of Hikashop, but got an error message. From it I understood, that didn't fill in post code (however it didn't mark as necessary). Now I can't refill in again and pay. Order number D4S5Y4E52
. Recently I've tried to buy business version again and have got next message:
Error
{"message": "Wrong or missing parameters (see details).", "id": "e1437bb0372111eb8ec7ad3d5832ed92", "object": "error", "details": {"shipping": {"postcode": "You must provide a non-empty string."}}}

Yes, I've already done it, but it doesn't work. I created new order and had an error again:
×
Error
{"message": "Wrong or missing parameters (see details).", "id": "aee745ae387311eb8ec9ad3d5832ed92", "object": "error", "details": {"shipping": {"postcode": "You must provide a non-empty string."}}}

I've cancelled all orders and tried to buy again. I've done it, thank you.