Attribution contention occurs at the ASIN level. This means if you promote the same ASINs across multiple orders your attribution tags with the same promoted ASINs will be eligible with each other for attribution.

This statement is True. Attribution contention in Amazon Attribution indeed occurs at the ASIN level. When multiple attribution tags promote the same ASINs and lead to a conversion, these tags will compete for attribution credit. Amazon's attribution model uses a last-touch attribution methodology, meaning the last clicked attribution tag that led to the sale of a specific ASIN will receive the attribution credit for that ASIN. This ensures that the most recent marketing touchpoint directly influencing the purchase of that particular product gets recognized.