Uh, oh @timmab89!
Please consider my apologies about this one. 
Yes, the correct setup is the authorization_url
because this is the one you are setting in your Paystack dashboard. We just need to fix the demo app.
You see, the transaction_charge
fix has changed the workflows order, which is why I’ve been referring to it, so in this case you firstly create a subaccount, then create a page (if needed, but in this case you’ll have to use the slug
implementation as per our demo), and only then initialize the transaction. And you will be able to type in the First and Last name of your customer.
Please let me know how it goes on your side as well.
Best,
Alex