Thanks to Goivvy LLC for contributing this topic!

Step 2. Add a new image

In this step, we will add the following image to the product with SKU MJ03.

New Image

We need to convert this image into a base64 string.

Open a bash terminal and use the base64 command to convert the image into base64.

Command:

base64 -i ~/Desktop/new-image.png
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base64 -i ~/Desktop/new-image.png

Response:

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..........[more characters]
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..........[more characters]

Copy the base64 string and use it in the following API call.

Endpoint:

POST http://domain.com/rest/default/V1/products/MJ03/media
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POST http://domain.com/rest/default/V1/products/MJ03/media

Payload

Response

{
    "entry": {
        "media_type": "image",
        "label": "Custom Image Number 1",
        "position": 1,
        "disabled": false,
        "types": [],
        "content": {
            "base64_encoded_data": "iVBORw0KGgoAAAANSUhEUgAAAc4AAAFmCAYAAADkqXozAAAKrGlDQ1BJQ0MgUHJvZmlsZQAASImVlwdUU8kax+fem16AkBABKaE3QToBpITQQpcONkISIJQQA0HFriwu4FpQEcGKLooouBZA1oootkWxANYNsqgo62LBhsq7wCG4+85..........[more characters]",
            "type": "image/png",
            "name": "custom_image_1.png"
        }
    }
}
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{
    "entry": {
        "media_type": "image",
        "label": "Custom Image Number 1",
        "position": 1,
        "disabled": false,
        "types": [],
        "content": {
            "base64_encoded_data": "iVBORw0KGgoAAAANSUhEUgAAAc4AAAFmCAYAAADkqXozAAAKrGlDQ1BJQ0MgUHJvZmlsZQAASImVlwdUU8kax+fem16AkBABKaE3QToBpITQQpcONkISIJQQA0HFriwu4FpQEcGKLooouBZA1oootkWxANYNsqgo62LBhsq7wCG4+85..........[more characters]",
            "type": "image/png",
            "name": "custom_image_1.png"
        }
    }
}