How to use ."in" filter in Supabase URL

I am trying to use ".in" filter of Supabase using its URL. However I can't query for more than 1 filter.

Working url

https://DATABASE_URL/rest/v1/patients?payer=in.(TERM1)

Here I get all the rows where payer is TERM1. However, when I try the following

https://DATABASE_URL/rest/v1/patients?payer=in.(TERM1, TERM2)

I only get all the rows where payer is TERM1. Expected output would be to get all the rows where payer is either TERM1 or TERM2

Payer column is of type text.

Any help would be appreciated! Thanks.