Note for NodeJS: Have a look at our demo project. You need to install the following modules:
npm i axios crypto-js qs

Note for C#: Have a look at our demo project

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Using the PHP client library
If you are using our PHP client library, there are setter and getter methods to access the PHP object properties.

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Integration manual
For more information about the usage of Payrexx Gateway, please visit Payrexx Gateway section.

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Fields transmission
All the fields[...] parameters need to follow each other and therefore need to be ordered. In python you can achieve that using OrderedDict.