Implement changes of Saferpay API 1.32

[sprain]

http://saferpay.github.io/jsonapi/#v1.32.0.0.20230117

[giriroub]

I created a PR for 1.23 to 1.31 with some (minor) BCs, that you could include in one release.

But 1.32 has a major BC http://saferpay.github.io/jsonapi/#v1.32.0.0.20230117 :

container ReturnUrls (parameters Success and Fail) is replaced by container ReturnUrl (parameter Url)

=> they replaced the 3 urls "success", "fail" and "abort" with one url "url". At least for us this is a bigger rewrite on the receiver end. I have therefore not included 1.32 in my PR and will create a separate one, so that you can create a release up to 1.31. Is that ok for you?