curl --location --request POST 'https://snakk-backend-production.up.railway.app/api/subscription/upgrade' \
--header 'X-API-Key: <api-key>' \
--header 'Content-Type: application/json' \
--data-raw '{
"plan_id": "00713021-9aea-41da-9a88-87760c08fa72",
"message": "string"
}'