Is there a way to pay respondents at the conclusion of the survey?
There is no built-in functionality within SurveyGizmo for providing incentives to survey respondents. However, it is possible to use existing functionality to cobble together an incentive system. Some of these have been discussed in previous Community discussions:
You can also find similar discussions in external forums. You will have to make you decisions based on the incentive you are providing and the level of effort you are willing to expend.