Survive App Install with custom parameter - Embed & Retrieve

Hi community! I have a unique 6 digit referral code for each user on my app. I'm having trouble extracting the referralCode when I add the referralCode to a dynamic link and then try having the receiving user retrieve/extract it after a fresh app install.

Would anyone be open to sharing their exact approach for doing this successfully with Flutterflow and Firebase? Perhaps sharing the code for how/where you place the parameter in the long dynamic link and the custom code to extract the parameter successfully to be used further in the app?

Any help would be appreciated.

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