cuperdino_best-practices | Stripe Developers | Page 1

vale stratusBOT Sep 13, 2024, 8:10 AM

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graceful depot Sep 13, 2024, 8:13 AM

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Hi, let me help you with this.

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Checkout is hosted by Stripe, meaning you will need to redirect your customers outside of your app.

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For iOS, I recommend you to stick to Mobile Payment Element with PaymentIntents, handle the items on your own, and just send the total amount to Stripe. You can of course still use Stripe Prices/Products as database for your assortment, if you want, just to keep track of the amounts.

glad axle Sep 13, 2024, 8:19 AM

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Thanks for the response! How would this work with regards to tax calculation? We want to have automatic tax calculation, and since tax can be different for different product categories, or even based on the amount within a product category (clothing under 110 USD is not taxed in NY, while over is etc). Is it even possible to then do automatic tax calculation, or should we manually call out to the tax calculation api for example, and then provide the total amount?

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And also do note we have just started looking into all of this, so I probably have a lot of misconceptions about how everything works 😄

graceful depot Sep 13, 2024, 8:22 AM

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Stripe Tax (automatic) is suppored for custom integrations with PaymentIntents, you will just need to provide the correct information to the tax calculation request: https://docs.stripe.com/tax/custom

glad axle Sep 13, 2024, 8:26 AM

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So the flow would be, create payment intent, calculate taxes, and provide the total amount to stripe, and that's it basically?

graceful depot Sep 13, 2024, 8:27 AM

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Correct

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I don't think there's a dedicated guide for iOS, but you can basically combine the Tax one above, and the standard iOS guide: https://docs.stripe.com/payments/accept-a-payment?platform=ios

glad axle Sep 13, 2024, 8:36 AM

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So the tax would have to be calculated and attached to the amount of payment intent (as the payment intent is the object that contains the amount) I am asking since the payment intent might be created many times, meaning the taxes might be calculated quite a few times without a purchase being ever completed. And from what I see, there is a cost attached to the Taxes API (0.05 per calculation if I am not mistaken). So just trying to see how to best approach that

graceful depot Sep 13, 2024, 8:39 AM

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Yeah, that's true. You might want to save the tax calculation to the last step in your checkout, but yeah, some will be wasted, unfortunately.

glad axle Sep 13, 2024, 8:40 AM

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Ok, thanks for the repsonses, vanya, I appreciate it, you were very helpful!

graceful depot Sep 13, 2024, 8:44 AM

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Happy to help.

glad axle Sep 13, 2024, 8:46 AM

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Is it possible to update the amount on a PaymentIntent somehow? For example return the intent without taxes, and upon payment calculate the taxes and attach them to the intent before finalising it?

graceful depot Sep 13, 2024, 8:47 AM

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Yes: https://docs.stripe.com/api/payment_intents/update#update_payment_intent-amount

glad axle Sep 13, 2024, 8:48 AM

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Awesome, thanks for the link

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