A digital planner/buyer should verify that potential vendors can accept the campaign's 3rd party tags during which phase?

Verifying that potential vendors can accept the campaign's third-party tags is a crucial step that should take place during the Request for Proposal (RFP) phase. This phase involves gathering detailed proposals from various vendors, which allows the digital planner or buyer to assess the capabilities and compatibility of each vendor with the campaign's requirements.

By confirming the acceptance of third-party tags at this stage, planners can ensure that the selected vendor's technology and processes align with the needs of the campaign. This includes understanding how well the vendor can integrate with the desired tracking and analytics tools, which is essential for measuring campaign performance accurately. Addressing these technical requirements early on helps avoid complications during the execution and launch of the campaign, ensuring a smoother workflow and better outcomes.