Return to the open redirect payment
Redirects the shopper’s browser to the provider page of the redirect
payment (PPRO, dLocal, Citcon) still open on the cart, so they can
finish it instead of opening a second one. This is the URL a cart’s
payment_resume_url names: the provider page link can carry a
replayable session credential, so it is never returned in an API
response and only travels as this redirect. The link carries a
short-lived token (t) minted into the cart the shopper reads and
never into callback payloads, so holding a cart token alone does not
redeem the provider page. Returns 404 when no open payment has a
provider page to return to (none is open, or the method, such as a
BLIK mandate, is approved in the shopper’s banking app), or when t
is missing, expired or not minted for this cart. Access is scoped by
the cart_token in the path. Returns 410 when the cart is already
completed or carries a charge.