We've seen this done in the past. This was discontinued due to some problems.
The relevant topic is below.
https://bitcointalk.org/index.php?topic=5098450.0Over the years that have passed Grin has made many innovations and improved itself.
now has multiple wallets working properly.
What are the chances of grin being used as a payment method again on the bitcointalk forum?
The answer to your question is in the first post of the topic you mentioned.
November 2021 update: grin payments are currently not being accepted. My payments code broke, and since grin payments were never very common, it hasn't been a priority to fix it.
So payment in Grin might come up someday, but it's not a high priority. I personally doubt it will appear in the near future.