Saw the banner on JB's website, but couldn't find a page on their website.
The offer is listed on LatitudePay's offer page. Appears to be available to new and existing customers, but only for 1st LatitudePay purchase at JB HiFi.
*To redeem $25 OFF, select LatitudePay at checkout and discount will be deducted at LatitudePay Payment Schedule. First purchase only. Offer available instore and online. Offer available to new and existing customers. Minimum spend $100. Offer ends 11:59pm 30/06/2021.