Changes to Unstake assets

added the pattern ^[0-9]+(\.[0-9]+)?$ to the request property amount

added the pattern ^[A-Za-z0-9.]+$ to the request property asset

removed the required property error from the response with the 500 status

removed the required property errors from the response with the 400 status

added the optional property details to the response with the 400 status

added the optional property details to the response with the 500 status

added the optional property error_code to the response with the 400 status

added the optional property error_code to the response with the 500 status

added the optional property message to the response with the 400 status

added the optional property message to the response with the 500 status

added the optional property request_id to the response with the 400 status

added the optional property request_id to the response with the 500 status

added the optional property timestamp to the response with the 400 status

added the optional property timestamp to the response with the 500 status

added the optional property user_message to the response with the 400 status

added the optional property user_message to the response with the 500 status

response property message/cooldown_period_days deprecated