Hidden costs to watch on each platform?

Ask suppliers to identify everything outside the proposed base contract: additional sites or environments, support tiers, separately licensed services, payment charges, apps and external integration hosting where applicable. Add data migration, storefront development, release testing, incident support and future changes. Record the commercial triggers that could alter each line item and the team responsible. These are questions for the specific offer, not a claim that every vendor charges the same extras or hides fees.

Official references: Salesforce pricing and editions; Adobe Commerce pricing.