curl -L \
--request POST \
--url '/v2/admin/program-memberships/{program_membership_id}/member-actions/activity' \
--header 'X-API-Key: YOUR_API_KEY' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--data 'activity[transaction_timestamp]=1&activity[value]=text&activity[activity_type_id]=text&idempotency_key=text&activity[line_items]='