The Amazon Ads Partner Network is a partner program run by Amazon Ads. Its pages describe it as a self-service hub where agencies and tool providers manage their business relationship with Amazon Ads. Tool providers here are companies that offer advertisers software, often SaaS (software used through a browser), to manage and optimize ad campaigns; agencies manage campaigns for advertisers by hand.
A business registers through an authorized representative, gives its business registration number, accepts the terms and conditions, then adds users and linked advertisers and submits a profile for the Amazon Ads partner directory, where advertisers look for help. Members get product guides, case studies, webinars and certifications with digital badges, and can earn advanced or verified partner status by showing results. Software companies that automate advertising for others request access to the Amazon Ads API through the Partner Network.
The pages state no fee for joining; it is a registration program, not a paid product.