i have same issue, apparently shopify removed this option but then oapyo also known as sage pay requested they/shopify reinstate it, the trick is you got to ask their payments team to make it available to you again, ive been trying for a week and thus fr no luck as it seems the are reluctant to do so.
chase shopify support tell them to make it available to you on your account.
i was told this by opayo technical support.