Insert or update a signature for Admin in context.
curl -i -X POST \
https://developer.herohealth.net/_mock/apis/public-api/openapi/v1/admin/signature \
-H 'Content-Type: application/json' \
-H 'x-api-key: YOUR_API_KEY_HERE' \
-H 'x-practice-group-id: YOUR_API_KEY_HERE' \
-d '{
"signature": "string"
}'curl -i -X PATCH \
https://developer.herohealth.net/_mock/apis/public-api/openapi/v1/admin/preferences \
-H 'Content-Type: application/json' \
-H 'x-api-key: YOUR_API_KEY_HERE' \
-H 'x-practice-group-id: YOUR_API_KEY_HERE' \
-d '{
"default_notification_channel": "string"
}'