post https://www.sandbox.striga.com/api/v1/card/activate-anonymous
"Anonymous" cards are physical Visa cards that are not personalized to one specific user. You may order a batch of cards and distribute these to end users who can then link these cards to an account after they have created an account.
Every "anonymous" card has a six digit reference code printed on the welcome letter inside your card carrier which the user enters into your application along with a 3DS password for that card and then this card begins to function like a regular physical card.
This is available only on production as no real cards are created on the sandbox.
NOTE: You can override only one delivery fee at a time.