Memberships database have actor column(s) and treaty column(s) but information on the other countries that are party to the treaties is often hard to read. The function generates a dataframe of treaty IDs and actors to a certain treaty.
Examples
if (FALSE) {
sample <- manyenviron::memberships$IEADB_MEM
retrieve_membership_list(actor = sample$CountryID, id = sample$manyID)
retrieve_membership_list(manyenviron::memberships)
}