UI SDK for Storefront

When Collection Pricing is enabled on your store, Dollarlabs exposes a set of helper functions on the global window object.

These functions let developers query pricing logic programmatically and build fully custom pricing, upsell, and UI experiences.

All APIs are read-only helpers and reflect the exact pricing rules configured inside the app.

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Availability & Requirements

These functions are available only when:

• Collection Pricing is enabled

• The app embed is active on the theme

• The page has finished loading (safe to call after DOMContentLoaded)

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1. DollarlabsGetBestPrice(variantId, quantity)

Returns the best applicable price for a given variant and quantity based on all active rules (customer tags, tiers, defaults, etc).

Signature

DollarlabsGetBestPrice("45132559613996", 55)

Parameters

Name	Type	Description
variantId	string	Shopify Variant ID
quantity	number	Quantity being evaluated

Use cases

• Custom product price displays

• Cart or PDP price recalculation

• Showing discounted prices outside native UI

Response

{
  "hasDiscount": true,
  "formattedPrice": "$148.34",
  "priceInCents": 14834,
  "originalPrice": 18314,
  "savingsPercentage": 19
}

Field breakdown

Field	Meaning
hasDiscount	Whether a discount applies
formattedPrice	Price formatted using store currency
priceInCents	Final unit price in cents
originalPrice	Original unit price in cents
savingsPercentage	Discount percentage applied

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2. DollarlabsGetNextTierWarning(variantId, quantity)

Returns information about the next pricing tier, if one exists. If no higher tier is configured, this function returns null.

This is especially useful for cart upsells and quantity nudges.

Signature

DollarlabsGetNextTierWarning("45132559613996", 51)

Use cases

• “Add X more items to save more” messages

• Dynamic cart banners

• Quantity-based upsell prompts

Response

{
  "itemsNeeded": 3,
  "nextTierQuantity": 6,
  "nextTierPrice": 146.83,
  "nextTierPriceFormatted": "$146.83",
  "currentQuantity": 3,
  "currentTierPrice": 147.59,
  "currentTierPriceFormatted": "$147.59",
  "savingsPerUnit": 0.7599999999999909,
  "savingsPercentage": 0.5,
  "tag": "Precio1",
  "discountMode": "specific_price"
}

Field breakdown

Field	Meaning
itemsNeeded	Units required to reach the next tier
nextTierQuantity	Quantity threshold for the next tier
nextTierPrice	Unit price at the next tier
currentTierPrice	Current unit price
savingsPerUnit	Savings per item at the next tier
tag	Customer tag applied
discountMode	Pricing mode used (specific_price, %, etc)

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3. DollarlabsGetPricingString(variantId)

Returns the raw pricing configuration (from the uploaded CSV) that applies to the variant.

This is useful when you want full control over how pricing tiers are displayed or need to plug the data into custom logic.

Signature

DollarlabsGetPricingString("44893358588063")

Use cases

• Custom pricing tables

• Tooltips or expandable tier breakdowns

• Advanced B2B pricing UI

Response

{
  "found": true,
  "pricings": [
    {
      "tagName": "Precio1",
      "pricingString": "1:148.34;3:147.59;6:146.83;12:146.07;24:145.32;c:1",
      "isCustomerTag": true,
      "isDefault": false
    }
  ],
  "customerTags": [
    "Precio1"
  ]
}

Notes

• pricingString is returned as-is from the CSV

• You are free to parse and render this however you want

• Multiple pricing rules may be returned if applicable

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Error Handling & Defaults

• If no pricing applies, functions return either:

  • hasDiscount: false, or

  • null (for next tier lookups)

• Functions never mutate cart or prices — they are pure helpers

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Best Practices

• Cache results where possible to avoid repeated calls

• Call these functions after customer context is available

• Use DollarlabsGetNextTierWarning for upsells instead of manually recalculating tiers

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If you’re building advanced B2B pricing experiences, these APIs give you full access to Dollarlabs’ pricing brain — without needing to re-implement any logic yourself.