germinator1778

[faint summit]

Hi

Is there any way to pass a url-parameter to the checkout page, which is then included in the checkout.Session.Completed event (or any other event) for us to handle in our webhook? (Preferably with the No-Code Option)
This is something dynamically, so you need to have a minimal code based integration. You can use Checkout Session with Subscription (Low code):
https://stripe.com/docs/billing/subscriptions/build-subscriptions
Make sure to pass the metadata when creating the Checkout Session:
https://stripe.com/docs/api/checkout/sessions/create#create_checkout_session-metadata

[faint summit]

How do we know, for which of our workspaces the subscription is, without using the custom field ?
You need to use metadata for this, custom fields are inputs set by the customer

Or is this not possible at all and we have to implement the entire checkout process ourselves with the stripe.js sdk?
That's the best option I think for you