Request the RESTful API as follows:
Endpoint: https://dev-invitation.azurewebsites.net/api/invitation
curl -X POST -d '{"message": "Message used for the signature", "signature": "Signature generated by your wallet", "market": "Market name (e.g., github)", "asset": "Your asset name (e.g., your/awesome-repo)", "email": "Your email address", "discord": "Your Discord name on the Dev Protocol server"}' https://dev-invitation.azurewebsites.net/api/invitation