Hello there,
I can solve the issue you are getting at the time of checkout. I have worked on many woocommerce sites and I am an expert in it. I am a WordPress/WooCommerce Developer and I am also very familiar with Python, WordPress, PHP, Web Design, CSS/HTML Adobe Photoshop, Node.js, Bootstrap, AngularJS, jQuery, Graphic Design, JavaScript, React.js, MySQL Administration, CSS3/HTML5, Woocommerce, eCommerce etc.
Please message me for further discussion.
Now, I am placing a placeholder bid as the amount field is compulsory to submit this bid.
Thanks and Regards.