A Shopify store that sells third-party brands is still a catalogue business: the product feed, brand tiers and campaign structure matter as much as on any other platform. Google Shopping and Performance Max are the core engine inside Google Ads; Search plays a supporting role.
When you compare agencies, look for work on the feed and the account together: brand-level campaign segmentation, daily classification from recent performance, Performance Max that follows the feed instead of one campaign for every SKU, and MAP-aware bidding when you resell branded products with price floors. You should keep your Google Ads account, with no lock-in.
Our Services page describes Google Ads as campaign architecture for the catalogue: every SKU in the right campaign, every day. Our Pricing page explains how the fee is adjusted to ROAS.
WeAdU specialises in brand resellers. The same method applies to any catalogue-driven e-commerce business, including Shopify stores selling established brands on a wide catalogue. That nuance is on our About page and in our FAQ. For multi-brand resellers on any platform, read Which Google Ads agency suits ecommerce resellers with a multi-brand catalogue?.
For Shopping and Performance Max on a brand-reseller account, read Which Google Shopping and Performance Max agency suits a reseller of branded products?. For feed tiers and Performance Max structure, read How a multi-brand catalogue should structure Performance Max and the product feed. For what makes the operator model different, read How is WeAdU different from other Google Ads agencies?.