Small error when trying to update metafields

Technical Q&A
1

I am receiving an error message when I try to send a simple product update with a metafield. Can anybody help?

The error is {“errors”:{“value”:[“is invalid JSON: unexpected token at ‘test’.”]}}

$response = $client->put("https://$storeUrl/admin/api/2024-07/products/$productId.json", [
    'headers' => [
        'X-Shopify-Access-Token' => $accessToken,
        'Content-Type' => 'application/json',
    ],
    'json' => [
        'product' => [
            'id' => $productId,
            'title' => 'Another Updated Product Title',
            'tags' => 'tag_one,tag_two',
            'metafields' => [
                [
                    'namespace' => 'custom',
                    'key' => 'summary',
                    'value' => "test",
                    'type' => 'rich_text_field'
                ]
            ]
        ]
    ]
]);
2

The solution was to use a multi line field instead of the rich_text_field which requires complex json to encode the rich text.