session: ********************curl --location 'https://api.snakk.ai/api/reseller/newsletter' \
--header 'Content-Type: application/json' \
--data '{
"subject": "string",
"body_blocks": [
{
"property1": "string",
"property2": "string"
}
],
"body_html": "string"
}'{
"recipients": 0,
"sent": 0,
"failed": 0
}