This week I was finished testing the pronamic ideal plugin for v3 ING advanced. I use the non sepa version now and it is working fine. All tests for v3 where ok, but when I changed the current configuration to the new v3 configuration, I got the white screen of death.
I changed back to the normal configuration by changing it in the DB and everything worked again. Second time it worked!! and I did a payment on the new v3 version.
Next day the screen of death appeared again without any changes being done??. In debug mode I got the following error:
Fatal error: Class 'XMLSecurityDSig' not found in ..\wp-content\plugins\pronamic-ideal\classes\Pronamic\Gateways\IDealAdvancedV3\Client.php on line 291
Any idea what causes this?