Amazon documents a refrigerator use for Dash Replenishment: automatically reordering a compatible replacement water filter. It does not establish a fridge that autonomously restocks groceries. Amazon’s developer materials describe Alexa smart-home integration and replenishment events, but do not identify an official PHP-specific DRS API or SDK.
What “self-replenishing” means for an Amazon-connected fridge
Amazon Dash Replenishment (DRS), presented to customers through Alexa as Smart Reorders, lets a connected device report supply level or consumption. Alexa can use that information to show inventory, send a low-supply notification, or automatically reorder a configured item when the customer enables Smart Reorders. Amazon’s example of a refrigerator paired with a replenishable item is a water filter—not groceries. Amazon’s DRS overview and its DRS FAQ describe the service and implementation requirements.
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That distinction matters: a fridge may be connected to Alexa without being DRS-enabled, and a DRS-enabled device does not thereby gain the ability to recognize missing food or shop for groceries. The documented use is replenishment of a registered consumable or replacement part, such as a compatible filter. Amazon’s Dash Replenishment customer page names refrigerators and water filters as an example, but does not establish that every refrigerator or filter model is supported.
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How device-level DRS works
The documented data path is device → device cloud → Alexa cloud. The device or its cloud reports inventory sensor data; Alexa uses it to support inventory display, notifications, or Smart Reorders. Amazon describes implementation using the Alexa Smart Home Skill API, an AWS Lambda function, and account linking. Its newer overview lists a smart-home add-on/custom skill with smart-home capability or a supported Alexa Connect Kit device, configured account linking, and an inventory sensor that reports on each use or at least once per day as prerequisites. See the DRS FAQ and DRS overview.
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Choose a sensor that matches what the device can measure
Amazon’s FAQ distinguishes three sensor approaches. The right one depends on whether the device measures remaining stock, consumption, or neither directly:
| Sensor approach | What it represents | When it fits |
|---|---|---|
| Level | Known amount remaining in the supply. | The device can measure how much consumable remains. |
| Usage | Known consumption for each reading; the supply is stored separately. | The device can measure use per event, rather than the remaining amount. |
| LevelUsage | A combined or estimated approach when neither remaining quantity nor per-reading consumption is directly known. | The device must report an inferred inventory state. |
Amazon’s FAQ describes at-least-daily reporting capability in the implementation requirements. The sensor’s units and reported values should reflect what the device can actually measure; the InventoryLevelSensor reference describes remaining inventory in count, percentage, volume, or weight as appropriate.
Register the device’s replenishable items
Each replenishment ID identifies a consumable product customers can order. Amazon’s InventoryLevelSensor reference says these IDs are supplied during discovery or later in an AddOrUpdateReport, and that their values cannot be changed after they are sent. In practice, a device maker needs to register the correct item, report inventory updates against it, and complete testing and certification. The Amazon interface reference and DRS overview describe these integration steps.
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What customers control in Alexa
Amazon says the low-supply notification option and Smart Reorders cannot both be active at the same time. Smart Reorders apply to products shown during that device’s setup, and customers can change the selected product in Alexa. Dash device management links customers to Alexa settings, where they can manage supply levels and reorder preferences. Details are in Amazon’s DRS FAQ and customer experience guidance.
Is there an Amazon DRS API or SDK for PHP?
The official Amazon materials cited here specify Alexa smart-home interfaces, account linking, inventory reporting, and related implementation components. They do not identify a PHP-specific DRS API or an official PHP SDK. PHP is therefore a possible language choice for a developer’s own cloud-side system, not an Amazon-provided PHP integration documented in these sources. Any such implementation would still need to meet Amazon’s Alexa and DRS interface, account-linking, reporting, testing, and certification requirements.
Do not confuse device DRS with the Selling Partner Replenishment API
Amazon uses “Replenishment API” for a separate seller-facing interface as well. The Selling Partner API Replenishment API returns Subscribe & Save replenishment offers and business metrics for vendors and FBA selling partners where Subscribe & Save is supported. It is not the device inventory sensor integration used to report a fridge filter’s supply level.
Quick Recap
| Amazon service | Purpose | Intended user |
|---|---|---|
| Device-level DRS / Alexa Smart Reorders | Uses connected-device inventory or usage reporting to support low-supply alerts or automatic reorders for configured consumables or parts. | Device makers implementing replenishment for items such as filters. |
| Selling Partner API Replenishment API | Provides Subscribe & Save offer and business metric information. | Amazon vendors and FBA selling partners building seller-facing tools. |
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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