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How to send message with image to slack channel using java

"attachments": [{
    "fallback": "The attachement isn't supported.",
    "title": "VALENTINE'S DAY OFFER",
    "color": "#9C1A22",
    "pretext": "Today's list of awesome offers picked for you",
    "author_name": "Preethi",
    "author_link": "https://www.hongkiat.com/blog/author/preethi/",
    "author_icon": "https://assets.hongkiat.com/uploads/author/preethi.jpg",
    "mrkdwn_in": ["text","fields"],
    "text": "Just click the site names and start buying. Get *extra reduction with the offer code*, if provided.",
    "thumb_url": "http://example.com/thumbnail.jpg"
}]

Source: hongkiat.com

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