Well if we are just talking about using cards. Then Kinesis money and Glint app are wonderful options. With Glint, you can sell your gold instantly with any purchase.
Discussion
The gold is in your custody?
If we are talking about self custody than goldbacks is your best option. Most accepted in the US. But starting to be accepted internationally. There are more gold notes companies being created which has helped the innovation of industry.
Think i stick with sats.