Is there a return API?

If you click on the order in Admin, there is a Return button. If you press the Return button, you can generate information related to Return, and I want to know what API does this function.

I would appreciate it if you let me know RestAPI first.
If you don’t have RestAPI, please let me know at least GraphQL.

GraphQL only, https://shopify.dev/docs/apps/fulfillment/returns-apps/returns

Additional reading:

https://help.shopify.com/en/manual/orders/self-serve-returns

https://help.shopify.com/en/manual/orders/refund-cancel-order

https://help.shopify.com/en/manual/customers/customer-accounts/new-customer-accounts

https://shopify.dev/docs/api/admin-graphql/latest/mutations/refundCreate

https://shopify.dev/docs/api/admin-rest/2023-10/resources/refund

https://community.shopify.com/topic/640771

Old defunct beta signup now that it’s publicly available https://www.shopify.com/return-api-beta

APRIL 25, 2023 https://changelog.shopify.com/posts/refund-to-an-existing-gift-card

FEBRUARY 07, 2023 https://changelog.shopify.com/posts/shopify-launches-a-customer-self-serve-returns-feature

JANUARY 12, 2023 https://changelog.shopify.com/posts/refunded-gift-cards-are-now-auto-disabled

Jan 2, 2023 https://shopify.dev/changelog/new-ways-to-manage-returns-with-the-graphql-admin-api

Mar 9, 2021 https://changelog.shopify.com/posts/cancel-a-return-is-now-available

OCTOBER 28, 2020 https://changelog.shopify.com/posts/manage-returns-directly-in-shopify