We can provide you with a trial account at WallexPay, where you can familiarise yourself with the merchant dashboard and test all the tools, but some pre-test steps are required from you:
1) Download a testnet Bitcoin wallet.
2) Get testnet* coins by visiting a designated website and entering your address, generated in the testnet Bitcoin wallet.
3) Wait for 1 confirmation to be able to spend test coins.
*Please note that Testnet Bitcoins are never supposed to have any value. More information about Bitcoin testnet is available here.