Delete a plan by ID
curl --request DELETE \
--url https://us.api.flexprice.io/v1/plans/{id} \
--header 'x-api-key: <api-key>'{
"message": "<string>"
}curl --request DELETE \
--url https://us.api.flexprice.io/v1/plans/{id} \
--header 'x-api-key: <api-key>'{
"message": "<string>"
}