my $payload = {
    'sender'        => {
            'name'  => $vars{'fromname'},
            'email' => $vars{'frommail'},
        },
    'to'            => [{
            'name'  => $vars{'name'},
            'email' => $vars{'email'},
        }],
    'subject'       => $vars{'subject'},
    'HTMLcontent'   => $body,
};
$payload->{'textContent'} = $vars{'preview'} if $vars{'preview'};

my $attrs = {
    'headers'   => $headers,
    'content'   => encode_json $payload,
};

##</code><code>##

encountered object 'Site::Email=HASH(0x55fa0a139c18)', but neither allow_blessed, convert_blessed nor allow_tags settings are enabled (or TO_JSON/FREEZE method missing)

##</code><code>##

my $email = Site::Email->new;
my $resp  = $email->send(
    'fname'     => $fname,
    'user'      => "$prefix$data{'idCRM'}",
    'token'     => $token,
    'template'  => 'newuser',
    'name'      => $to,
    'email'     => $email,
    'subject'   => 'Your Book Boost Account...'
);