Carries the token that Shopify successfully issued but that could not be durably written, so a caller can retry the persistence instead of losing the token.

Returned inside {:error, {:token_persistence_failed_after_refresh, %PersistenceFailure{}}} by ExShopifyApp.AccessToken.Repo.refresh_token/3 and migrate_token/3 when the Shopify exchange succeeded but the durable write inside the surrounding transaction failed (e.g. a transient connection drop or timeout).

By the time this surfaces, Shopify has already invalidated the prior token, so re-running the exchange will fail — the only recovery is to persist token (for example via the store's put_token/2). reason is the original write error for logging/classification.