SSL SKU を通じて HTTPS 化されたイメージ URL にすることで、イメージを利用した LINE メッセージ配信ができるようになります。
この配信を予定されている場合は、別途 SSL 証明書の購入をご検討ください。
★ アカウントブランド設定の SSL 証明書
https://help.salesforce.com/articleView?id=mc_es_ssl_certificates.htm&type=5
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