How can I save the card information obtained by Square Payment Form?
What variables should I send to the server side?
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For storing a card on file you’ll use the Cards API to save the customers card on file from the token that’s collected from the Web Payments SDK. 
In the following code
result.token
variable?
Here’s a general explanation of how result.token is used in the context of the Square Web Payments SDK:
Usage of result.token
- Payment Method Request:
- When you use the Web Payments SDK to collect payment information from the customer, you typically call a method to request a payment token. This involves displaying the payment form and handling the customer’s input.
- Handling the Response:
- Once the customer submits their payment information, the SDK processes this information and returns a result object. This object contains the
tokenproperty, which is the payment token.
- Using the Token:
- The
result.tokenis then sent to your server, where you can use it to create a payment or store it for future transactions (if allowed by the customer’s consent and Square’s policies). - On the server side, you would use the Square Payments API to create a payment using this token.
Understood. Just to confirm, if I implement the client side using the code below as a reference, does that mean it is compatible with 3DS?
Yes, it’s compatible with 3DS. Here is a link to our update Charge and Store quickstart example.
The server-side python square API version is
square_version='2023-04-19',.
will it still support the 3DS?
Yes, it will support 3DS with version 2023-04-19.