Simple Custom Magento Extension for auto update of product attributes

Simple Custom Magento Extension for auto update of product attributes We need a custom extension to update Magento products' attributes by Smartsheet. Smartsheet ([login to view URL]) is advanced spreadsheet. If you already have experience in [login to view URL] API, that's a big plus for this job. The extension should automatically and periodically call [login to view URL] API to update the Magento attributes with the cells in Smartsheet. So basically, it's about syncing the Magento products with Smartsheets. Here are the features the extension should provide. IN MAGENTO ADMIN CONFIGURATION PAGE 1. The store administrator can set A. Smartsheet account info, B. sheet names (there are multiple sheets), C. mapping tables between Magento attributes and Smartsheet columns (he can add a mapping by choosing a Magento attributes dropdown and entering Smartsheet column name.) D. any other settings necessary for mapping between Margento and Smartsheet. 2. There is supposed to be a filter that can limit the products to be updated. For example, if we refine the inventory to be "Yes", only the products with inventory "Yes" will be updated and the ones with "No" inventory will be ignored. 3. There must be settings for cronjob - period about how often to run auto-update WHILE RUNNING AUTO-UPDATE If Smartsheet has SKU not found in Magento, it should create a new product with the SKU in Magento.