Call Method in Service does not recognize Class working with Stripe Webhooks and Rails 7 - stripe-payments

Question

I successfully added the Stripe API to my application by creating a Checkout Session object. I can therefore process payments. The next step is to set up the Webhook which will then change my payment_status to paid. I am working with a Booking class.
I set up a service with a call method in app/services which is the following:
class StripeCheckoutSessionService
def call(event)
booking = Booking.find_by(checkout_session_id: event.data.object.id)
booking.update(payment_status: 1)
render json: { state: "processed" }, status: :ok
end
end
Testing the Webhoook locally through Stripes CLI throws me the following error:
Booking Load (0.3ms) SELECT "bookings".* FROM "bookings" WHERE "bookings"."checkout_session_id" = $1 LIMIT $2 [["checkout_session_id", "cs_test_a1bcREeeCzBEtGQJPUyr5YqCiPtVJYXBItvHEeayYgKP2Rtr1qOih3SJRI"], ["LIMIT", 1]]
↳ app/services/stripe_checkout_session_service.rb:3:in `call'
Completed 500 Internal Server Error in 27ms (ActiveRecord: 5.8ms | Allocations: 13382)
NoMethodError (undefined method `update' for nil:NilClass):
It apparently doesn't recognize my Class Booking. All the other requests return 200:
2022-12-21 18:21:49 --> product.created [evt_1MHVzEKr4qTfokMbZmt0oXj6]
2022-12-21 18:21:49 <-- [200] POST http://localhost:3000/update-payment [evt_1MHVzEKr4qTfokMbZmt0oXj6]
2022-12-21 18:21:49 --> price.created [evt_1MHVzFKr4qTfokMbi5lDKURc]
2022-12-21 18:21:49 <-- [200] POST http://localhost:3000/update-payment [evt_1MHVzFKr4qTfokMbi5lDKURc]
2022-12-21 18:21:53 --> checkout.session.completed [evt_1MHVzJKr4qTfokMbQPa7g9Cz]
2022-12-21 18:21:53 <-- [500] POST http://localhost:3000/update-payment [evt_1MHVzJKr4qTfokMbQPa7g9Cz]
2022-12-21 18:21:53 --> charge.succeeded [evt_3MHVzHKr4qTfokMb0CfRjM3Y]
2022-12-21 18:21:53 <-- [200] POST http://localhost:3000/update-payment [evt_3MHVzHKr4qTfokMb0CfRjM3Y]
2022-12-21 18:21:53 --> payment_intent.succeeded [evt_3MHVzHKr4qTfokMb0O5Ivb3a]
2022-12-21 18:21:53 <-- [200] POST http://localhost:3000/update-payment [evt_3MHVzHKr4qTfokMb0O5Ivb3a]
2022-12-21 18:21:53 --> payment_intent.created [evt_3MHVzHKr4qTfokMb04ftdUAI]
2022-12-21 18:21:53 <-- [200] POST http://localhost:3000/update-payment [evt_3MHVzHKr4qTfokMb04ftdUAI]
Honestly, I don't know what to try. A require_relative of the model is not going to work. I am pretty new to services, so I literally can't understand why it wouldn't recognize my class.

Answer 1

I think your Booking class is being imported correctly. However, it looks like this line is returning nil:
booking = Booking.find_by(checkout_session_id: event.data.object.id)
Try logging out the value of "booking" and dig into what exactly the find_by method is doing. The error thrown means that "booking" is being set to Nil, so attempting to run the "update" method on "booking" returns an error.