What's the best approach for omnichannel discount coordination?

As an e-commerce manager, I'm struggling to create a cohesive discount strategy across multiple sales channels like my online store, physical retail locations, social media platforms, and marketplace listings. Each channel seems to operate in isolation, leading to inconsistent pricing, customer confusion, and potential brand reputation damage. I need a comprehensive approach that ensures uniform pricing, synchronized promotions, and a seamless customer experience regardless of where they interact with my brand. How can I effectively coordinate discounts across different channels while maintaining pricing integrity and maximizing conversion potential?