Describe an observable result
Write down what someone should be able to do at handover. For an integration, that could mean receiving a test order in the ERP with the same totals as the shop.
Make replies comparable
Name the person providing access and materials, the deadline and what is already ready. Ask for assumptions, exclusions and a first milestone.
Working template
Goal [ ] Deliverable [ ] Available materials [ ] Budget or agreement [ ] Deadline [ ] Acceptance check [ ]