Cannot speak to Baremetrics but ChartMogul has a useful feature for connecting the subscriptions. If you are creating a new subscription with that invoice, then you can merge subscriptions and avoid false churn.
2nd option is if you are not creating a new subscription is to have the invoice service date start before cancelling the credit card - that would result in expansion (by invoice amount) and contraction (by credit card amount) and ultimately your MRR would be ok with no churn.
https://help.chartmogul.com/hc/en-us/articles/115005750705-M...
2nd option is if you are not creating a new subscription is to have the invoice service date start before cancelling the credit card - that would result in expansion (by invoice amount) and contraction (by credit card amount) and ultimately your MRR would be ok with no churn.