Data Add-On purchases can be collected simply by purchasing any Add-Ons when choosing your plan. Each Add-On that is chosen will count as one purchase. All purchases will be recorded on the Rewards tab. Free Add-On such as the Boost & PUBG Add-On will not add to your purchase count.
Roam Like Home Zone A/B/C purchases can be collected by purchasing the respective Roaming Passes. Each 1-day Roaming Pass purchased will count as one purchase. Similarly, a 3-day Roaming Pass will count as three purchases and a 7-day Roaming Pass will count as seven purchases.