Note for NodeJS: You need to install the following modules:
npm i axios crypto-js qs

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Integration manual

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

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Secure payment process using this endpoint

You could use this endpoint, for example, to verify a webhook you have received.
You get a webhook for a successful payment and you would like to check whether this gateway payment has actually been paid.