Where to post question regarding sentry /envelope endpoint

[Hussain-f]

Hi, rather than using Sentry SDK, I am opting to use a raw client to send events/alerts to sentry (not self hosted). I have gone through
https://develop.sentry.dev/sdk/event-payloads/
https://develop.sentry.dev/sdk/envelopes/
https://develop.sentry.dev/sdk/event-payloads/types/
as well as a few examples online however no matter how I build the payload, I keep getting the following response from Sentry
{ "detail": "invalid event envelope", "causes": [ "missing newline after header or payload" ] }

When I send a payload with just a header, I presume it works because I get a 200 response in Postman and the event_id is returned in the response, however I cannot see any changes on the sentry dashboard. But if I add any items to the envelope I get a 400 response code.