SQL example

DECLARE @body VARCHAR(MAX)

SET @body = CONCAT(
    '{
        "bps": {
            "api_key": "{BRP:-2}",' , '
            "form_id": "FORM_ID",
            "service": "base64",
            "request": [
                {
                    "qr_text": "{BRP:-3}', '",
                    "qr_name": "', '{BRP:-4}', '",
                    "qr_ext": "png",
                    "qr_charset": "', '{BRP:-5}', '",
                    "qr_size": 100
                }
            ]
        }
     }'
)

SELECT @body