STOCK

“Out of Stock:” If checked, all out-of-stock products will display “Call for Price”.
“Minimum Threshold:” Enable this to show “Call for Price” on products with low stock.
“Minimum Stock Quantity:” Set the minimum stock quantity required to trigger the “Call for Price” feature.

TAXONOMY

“Enable Taxonomy:” Enable this option to apply “Call for Price” to specific categories.
“Select Categories:” Choose the categories that will have the “Call for Price” option.
“Select Tags:” Select multiple tags to enable “Call for Price” for tagged products.