firstname & lastname not visible in paynl admin when adding merchant

[sweebee]

When adding a new merchant with an account, the firstname and lastname are nowhere to be found in the pay.nl admin. If i manually add a account in the admin the first and lastname work. When I receive the welcome email it show the first and lastname though.

sdk-alliance/samples/addMerchant.php

Line 20 in 8fd3f64

'firstname' => 'Firstname',