When first onboarded, Accumula runs a one time, initial matching of products between Shopify and point of sale to ensure that products sync. After this initial matching is performed, Accumula defaults to "realtime" mode and will save the IDs of products as they are published from point of sale. This "Realtime" Sync Type is optimized for the fastest sync possible between systems.
If you prefer to create products in Shopify manually or via some other integration, you may set the Sync Type to "Match on the Fly". When enabled, during each integration cycle, Accumula will attempt to match any newly tagged products to existing products in Shopify "on the fly". If there is no match, a new products will be queued to create. This option is slower than the "Realtime" option.
NOTE: We generally recommend turning off "Create Products" when using this option so that new products will not be created if there is no match.
The matching field is determined by the SKU Source setting. Both the Sync Type and SKU Source settings can be found in Apps > Shopify > Products.