Is it possible to have a POWR form appear only when the product is selected with the "Buy" button?

Please note that you can only achieve this by using Display On Click feature in your App Dashboard > Design.

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However, be advised that in this case, your form will be triggered by our own floating tab or button.

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There isn't unfortunately a way to make your forms appear once the product is selected with the "Buy" button at this time. Please feel free to submit a feature request here: https://help.powr.io/hc/en-us/articles/360036648674-Submit-A-Feature-Request