I believe their current API is intended for people who want to automate sending payments to other people. (like program owners who want to automate payouts) (your API call must contain the password for the account sending the money).
To incorporate Paxum into a wordpress (or other) invoicing system, what you need is an IPN (like Paypal, Okpay, Libertyreserve, Alertpay, Cashx etc have). Luckily they are working on it (so I have been told) and hopefully they'll be able to implement it very soon.
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