How to enable per-product currency pricing and set prices via Backend API (swell-node)?

[dexterdotbuzz]

Hi, I'm using swell-node v6.0.3 with "Priced" multi-currency (not conversion-based).
My store has 7 currencies enabled (USD base + TWD, CAD, SGD, EUR, JPY, KRW), all set
to Kind: Priced.

I need to programmatically set per-product currency prices for ~83 products. I've
tried two approaches — neither fully works:

Approach 1: Writing to currencies field
await swell.put('/products/{id}', {
id: productId,
currencies: {
EUR: { price: 388.95 },
TWD: { price: 14300 },
JPY: { price: 71200 },
KRW: { price: 672000 },
},
});
Result: The currencies field is stored (confirmed via GET), and prices show correctly
in the dashboard only for currencies already enabled on the product. But this
doesn't enable a currency on the product — JPY and KRW don't appear in the product's
pricing section until I manually check them in the dashboard's currency dropdown.

Approach 2: PUT with ?currency=JPY query param
await swell.request('put', /products/${productId}?currency=JPY, {
price: 71200,
});
Result: Returns the correct price in the response, but overwrites the product's base
currency context. After setting multiple currencies sequentially, only the last one
persists.

My questions:

1. How do I enable a currency on a product via the API? (equivalent to checking
   JPY/KRW in the dashboard's currency dropdown)
2. What is the correct API call to set prices for multiple currencies on a single
   product in one request?
3. Is $currency the right field name for swell-node v6, or is it currencies? The SDK
   seems to strip $-prefixed fields.

[sstakhovski]

Try to update "purchase_options.standard":

  const product = await client.put('/products/{id}', {
      id: '69b143afcf175a00125524d1',
      purchase_options: {
        standard: {
          price: 40,
          $currency: {
            USD: {
              price: 40,
            },
            EUR: {
              price: 38,
            },
          },
        },
      },
    })

Set the price for the base currency (USD in my store) and set the price for each currency you want to update (including the base currency) in the $currency section (USD and EUR in my store).