[BUG] CustomerPaymentMethodsListResponse returns 404 when there is no customer tied to a payment

[vsrivatsa-edinburgh]

Bug Description

CustomerPaymentMethodsListResponse returns 404 when there is no customer tied to a payment

Expected Behavior

Return a 200 response somehow indicating that a customer is not associated with the payment

Actual Behavior

A 404 response with "Customer does not exist in our records" is being returned, although the customer_id is null

Steps To Reproduce

Provide an unambiguous set of steps to reproduce this bug. Include code or configuration to reproduce, if relevant.

1. Create a payment intent with customer_id as null
2. GET /customers/payment_methods?client_secret={client_secret}
3. Observe the response and status code

Context For The Bug

No response

Environment

Are you using hyperswitch hosted version? Yes/No
If yes, please provide the value of the x-request-id response header to help us debug your issue.

If not (or if building/running locally), please provide the following details:

1. Operating System or Linux distribution:
2. Rust version (output of rustc --version): ``
3. App version (output of cargo r --features vergen -- --version): ``

Have you spent some time checking if this bug has been raised before?

• I checked and didn't find a similar issue

Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

Are you willing to submit a PR?

Yes, I am willing to submit a PR!