I'm glad you appreciated the post. As the payload says is not a good idea to send card data directly to the API, when I wrote this article that was not a problem yet. Now you need to send a token that represents your card, and in your client side the form for credit card data is provided by stripe elements api (a js lib). I mean to publish a new article approaching that, but feel free to reach me out on twitter (@BrunoFeres4) and we can discuss it further.