Buys stopped working

I have been running the same Sell/Buy API calls for months. Recently, without code change, Buy stopped working. Sell still works fine. The error I’m receiving all of a sudden is this:
Call failed with status code 400 (Bad Request): POST<account number>/buys
Did the required parameters change recently for /buys?

Welcome to the Coinbase Cloud Developer forum, @jatpiano ! Just to confirm, are you still experiencing this issue as of the moment? Kindly check our documentation for Place buy order for reference. If the issue still persists, then to further help you with your concern, we suggest you to open a support ticket with our team with the following details:

  • Please provide a code snippet you are using in placing a buy order.
  • Please provide a screenshot of the error code you are experiencing.
  • Please share to us the last time that you were able to successfully place a buy order.
  • If you have any more information or screenshot that can demonstrate your concern, feel free to share it with us. Please ensure to send any images or screenshots as attachments, as we’re unable to see images/screenshots when they are inserted in the body of your email and be reminded to omit any personal info.

Upon creating a support ticket, kindly include the link of this forum so that the team will be aware that it’s you. Additionally, please use the email address associated with your Coinbase account.Thank you and have a nice day!