I am using a Share button to share my page to Facebook. The url I am wanting to share includes a referral parameter
The referral code id an 8 character random string eg referral=19aQa5qE
All was working well but now Facebook is adding a further long string /?referral=19aQa5qE&fbclid=IwAR2qN5cFGDHtF_GV0euEhQlB2x4N8fPca-BtxoZMUm0Czsc8q-jddIAkMiQ
So when I now want to get that id when a user signs up by making changes to the referring user
it no longer works and I get nothing in this ReferringUser field.
How can I limit the id to just the first 8 characters ?
Thanks in advance