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-rw-r--r--taler-merchant-pos-terminal.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/taler-merchant-pos-terminal.rst b/taler-merchant-pos-terminal.rst
index 8575ab8d..ea27fe8b 100644
--- a/taler-merchant-pos-terminal.rst
+++ b/taler-merchant-pos-terminal.rst
@@ -147,7 +147,7 @@ The elements of the JSON file are defined as follows:
interface MerchantProduct {
// A merchant-internal unique identifier for the product
- product_id: string;
+ product_id?: string;
// Human-readable product description
// that will be shown to the user and used in contract terms