All our post meta fields are prefixed with inventory_presser_. The hash key holds an MD5 hash checksum of the bytes of the image file, but the plugin generates this value and the VIN when photos are inserted via the REST API with a vehicle post ID specified as the post_parent.

Meta KeySample Value
inventory_presser_hash8e2f32b2e2aac89eb1ed117e1c98d7b0
inventory_presser_photo_number1
inventory_presser_vin1GNSKBKC7FR248814

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