The catalog is your list of products and prices. Add a product once, then sell it from a payment link, and the price follows the catalog. Open Catalog in the sidebar. It needs the catalog:manage permission.
Add a product
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Choose New product.
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Enter a Name, for example
Premium coffee. -
Enter a SKU, your own unique code, for example
COFFEE-001. You cannot change it later. -
Under Prices, pick a Currency and type the Amount, for example
25.000,00for IDR. Indonesian formatting groups thousands with.and marks decimals with,. -
Optionally add a Description.
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Choose Create product.

Price in more than one currency
Choose Add price to list the same product in another currency. A buyer is charged in the currency of the link that sells it, so add a price for each currency you sell in.

Metadata
Metadata is optional key and value pairs, for example size and large. They are for your own records and come back on the product when you read it through the API.
Edit a product
Choose the pencil on a row to change the name, description, prices or metadata, then Save changes. New links use the new price. A payment that was already taken keeps the price it was taken at.

Archive a product
Choose the archive button on a row and confirm. An archived product stops appearing in the catalog and cannot go into new links. Payments already taken for it are not affected.
Sell it
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Open Payment links and choose Create link.
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Pick the kind From catalog.
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Select the Product, the currency and the quantity.
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Save, then copy the link or its QR code.

More on links in Payment links.
Good to know
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A product needs at least one price.
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A link can only be priced in a currency the product has a price for.
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Building this into your own app? See the API docs.