Q: Click and Buy announced termination of service at 30.04.2016.

Same here in Germany. A credit card is not an option for me. Gift cards aren't also an option, there is no credit on it, if I need it ;-)

Best practice is something like Click&Buy with direct debit. Amazon has it too, why Apple not?

So, if there will be no possibility with direct debit, I will buy only Kindle books, order my Music only at Amazon and use only free apps.

post-paid mobile phone billing or pre-paid mobile phone billing

Set up mobile phone billing as your payment method in the iTunes Store, App Store, or iBooks Store - Apple Support

This mobile phone billing can be used as the payment method.

• Mobile Billing: In Austria it is called Direct Billing, or Mobile Billing.

Refer the link - http://www.globway.eu/services/

itunes999 : from the Apple Support page that you originally linked to : Set up mobile phone billing as your payment method in the iTunes Store, App Store, or iBooks Store - Apple Support

Mobile phone billing is currently available with select carriers in Germany and Russia.

Rothschild : I'm not aware that any replacement payment method has been announced, so I assume that you'll only have the other payment options that show on your account

These instructions are not usable. On iPad and iPhone I got this message after taping on payment options "Click & Buy is not available on this device, use the iTunes Store on your PC". If I click the link, I shall download iTunes. But I have only Linux computers, there is no chance to run iTunes on this devices.

DL7BJ wrote:

 

Best practice is something like Click&Buy with direct debit. Amazon has it too, why Apple not?

It's not a question of Apple choosing to drop it: ClickandBuy are terminating the service so it won't be available in Amazon either.

https://www.clickandbuy.com/en/

Sorry, I wrote it incomprehensible. Amazon has direct debit without Click&Buy or other service provider.