WordPress Payment link will not transform PHP vars into values

If I understand correct this should work but as cybmeta said ask the support team of the theme/plugin.

[insert_php]echo "https://www.pay.nl/payment/SL-9839-2480/3Lc2c5c/?amount_min=7497&extra1%5BCID%5d=" . $GLOBALS[‘user_id’] . "&extra2%5BNaam%5D=" . $GLOBALS[‘user_lastname’] . "&extra3%5BEmail%5D=" . $GLOBALS[‘user_email’][/insert_php]