Add support for Twint

[McPringle]

Is your feature request related to a problem? Please describe.
In Switzerland using Twint for payment is very popular and easy to use for the customer.

Describe the solution you'd like
Like with PayPal, I would like to select "Twint" as an online payment method.

As a first step, it would be sufficient to configure a Link, which will be displayed to the customer during checkout. The organizer can then mark the pending tickets as paid manually.

A final solution should work like the PayPal integration where Alf.io gets information of the money transfer automatically.

Describe alternatives you've considered
For now I have added a link to a Twint payment page as a text in the bank account information. That is not intuitive. We have to tell the people to select "bank transfer" first.

Additional context
For Switzerland, Twint support is a must-have. :-)

[syjer]

Hi @McPringle we already support twint via Saferpay as a provider (

alf.io/src/main/java/alfio/manager/payment/saferpay/PaymentPageInitializeRequestBuilder.java

Line 49 in 2dc1cec

PaymentMethod.TWINT.name()

).

A full direct twint integration is not really possible (we asked twint about that if there were some kind of api): for e-commerce they expect we integrate with a 3rd party provider.

[McPringle]

Didn't know that Twint is supported via Saferpay. I'll have a look at it.

[McPringle]

Twint can be implemented via RaiseNow. The developer documention can be found here:
https://docs.raisenow.com/