Hello @johnspence0bbf
You can use the below code it worked for me. I used it on the Console commad as it will run in a cron job.
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$state = $objectManager->get('\Magento\Framework\App\State');
$productRepository = $objectManager->get('\Magento\Catalog\Api\ProductRepositoryInterface');
$versionManager = $objectManager->get('\Magento\Staging\Model\VersionManager');
$productStaging = $objectManager->get('\Magento\CatalogStaging\Api\ProductStagingInterface');
$updateRepository = $objectManager->get('\Magento\Staging\Api\UpdateRepositoryInterface');
$updateFactory = $objectManager->get('\Magento\Staging\Api\Data\UpdateInterface');
$timezone = $objectManager->get('\Magento\Framework\Stdlib\DateTime\Timezone');
$storeManger = $objectManager->get('\Magento\Store\Model\StoreManagerInterface');
$storeId = $storeManger->getStore()->getId();
$timezonefill = $timezone->getConfigTimezone(\Magento\Store\Model\ScopeInterface::SCOPE_STORES, $storeId);
$currentDate = new \DateTime('now', new \DateTimeZone($timezonefill));
$date = $currentDate->format("Y-m-d");
$state->setAreaCode('frontend');
/** @var \Magento\Staging\Api\Data\UpdateInterface $schedule */
$schedule = $updateFactory;
$schedule->setName("Price Update #");
$schedule->setStartTime("2020-06-22 00:00:00");
$schedule->setEndTime("2020-07-23 23:59:59");
$stagingRepo = $updateRepository->save($schedule);
$versionManager->setCurrentVersionId($stagingRepo->getId());
$product = $productRepository->get("123456"); // Product SKU
$product->setPrice("10"); // Price
$productStaging->schedule($product, $stagingRepo->getId());
It may help you!
Thank you
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