Generate ad images from campaign briefs with GPT-4o and OpenAI Image API

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        "end_date": "2024-08-15",
        "start_date": "2024-07-15",
        "campaign_id": "CS20240715-001",
        "campaign_name": "Summer Sale 2024",
        "call_to_action": "Shop Now!",
        "target_audience": "Young adults, 18-30, interested in fashion and lifestyle.",
        "additional_notes": "Please ensure the images convey a sense of fun and freedom associated with summer.",
        "brand_guidelines": {
          "font_style": "Modern Sans-serif",
          "primary_color": "#FF6B6B",
          "secondary_color": "#4ECDC4"
        },
        "image_aspect_ratio": "16:9",
        "key_selling_points": [
          "Limited-time discounts up to 50%",
          "Free shipping on orders over $75",
          "New arrivals daily"
        ],
        "desired_image_style": "Photorealistic, bright, energetic, aspirational.",
        "product_description": "A vibrant collection of summer apparel, including swimwear, light dresses, and casual shorts. Focus on bright colors and breathable fabrics.",
        "marketing_manager_email": "jane.doe@example.com"
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