LucidLaw

[keen sorrel]

Hi there!

So in your flow the customer already had an existing payment method when you created the subscription?

[sage lichen]

Yes correct

3d card is already attached to the customer

as a default

[keen sorrel]

Got it. So a few things:

• When you create the subscription, you could use expand: ["latest_invoice.payment_intent"] to directly retrieve the PaymentIntent with no extra API call
• If you are directly using next_action.use_stripe_sdk.stripe_js, I would strongly recommend to stop because this can break. Instead you should call https://stripe.com/docs/js/payment_intents/confirm_card_payment#stripe_confirm_card_payment-attached on your frontend to start the 3DS flow.

[sage lichen]

so what means I need to create an intent first

before I call subscribe API?

[keen sorrel]

No, why are you saying this?

When you create a new subscription, add expand: ["latest_invoice.payment_intent"] to the API call. In the reponse you will directly get the client_sercet of the PaymentIntent, so you can confirm it on the frontend to do the 3DS flow.

[sage lichen]

Okay wait I'm checking the docs now, sorry we're pretty new to stripe

[keen sorrel]

Here's the main doc explaing how to create a subscription. Note that this doc assumes that the customer doesn't have a PaymentMethod: https://stripe.com/docs/billing/subscriptions/build-subscriptions?ui=elements

[sage lichen]

Okay wait

I can't seems to find the option of adding latest_invoice.payment_intent in creating subscription

I'm using this https://api.stripe.com/v1/subscriptions

docs
https://stripe.com/docs/api/subscriptions/create

[keen sorrel]

Have you tried? Did you get an error message? If so can you share the request ID (req_xxx)?

[sage lichen]

can you please send me the docs on this part

We are currently developing all the APIs for the mobile app by the way, so we are using APIs only

---

"When you create a new subscription, add expand: ["latest_invoice.payment_intent"]"

where can I find this? what will I pass?

[keen sorrel]

It's in the doc I shared earlier: https://stripe.com/docs/billing/subscriptions/build-subscriptions?ui=elements#create-subscription

[sage lichen]

We are not using that

we are using this API

https://stripe.com/docs/api/subscriptions/create

[keen sorrel]

Exactly, that's what the link I shared with you is using:

[sage lichen]

we are using the PHP curl

I sent the APIs we've use

1. We subscribe to a Plan using a 3D card, we pass "payment_behavior=allow_incomplete" (https://api.stripe.com/v1/subscriptions)

[keen sorrel]

we are using the PHP curl
Are you using PHP or CURL? These are two different things.

[sage lichen]

Sorry CURL

[keen sorrel]

With curl it's probably something like this: -d "expand[]"="latest_invoice.payment_intent"

[sage lichen]

okay wait

it works

thank you!

how come its not on the docs?

[weak copper]

why isn't what in the docs exactly?

and to clarify, now that you have the PaymentIntent, what are you going to do with it? how do you intend to handle 3D Secure? With our frontend libraries or not?

[sage lichen]

the expand parameter

https://stripe.com/docs/api/subscriptions/create

Good question and exactly what I want ask too, initially I was thinking my next steps are the following. (Pleas correct me)

[weak copper]

If i have to answer 'why', it's because all endpoints take that so it's not mentioned on each one, it's instead extensively documented at https://stripe.com/docs/expand/ and https://stripe.com/docs/api/expanding_objects and each field has a expandable label linking to those.

[sage lichen]

1. I will call the Payment Intent retrieve API (https://api.stripe.com/v1/payment_intents/pi_3MI9MgLlkdPoC87s0Yiq0dZs)
2. Get the next_action.use_stripe_sdk.stripe_js value (which is the URL) and then use it on an iframe

[weak copper]

incorrect

[sage lichen]

thank you!

what should be best

[weak copper]

you can not parse the field yourself

well you should be using https://stripe.com/docs/billing/subscriptions/build-subscriptions?ui=elements which explains how you use the client_secret of the PaymentIntent with our frontend stripe.js library to call functions like confirmPayment that process the payment and present 3D Secure if needed

[sage lichen]

Okay wait checking

where can I get the CLIENT_SECRET?

sorry confuse with this part

[weak copper]

it's in the PaymentIntent

subscription->latest_invoice->payment_intent->client_secret

[sage lichen]

ah see it thank you

okay wait

Okay, I need to do the testing and code it myself for me to fully understand the process

will this thread will be closed?

or I can message later on?

[weak copper]

it'll be locked in an ~hour or so but you can always ask in the main channel

[sage lichen]

got it