I need assistance in developing an API integration to connect our PrestaShop store with the OnBuy marketplace. The main tasks will include publishing our well-organized product catalog on OnBuy, synchronizing stock levels and pricing in real-time, and enabling seamless order management. Orders from OnBuy should be pulled into our PrestaShop back office and updated on the marketplace upon processing. Additionally, while I am undecided on automating process updates on OnBuy, the flexibility to adjust this feature would be appreciated. Please ensure the system is robust and reliable to maintain smooth operations across platforms.