diff --git a/taler-kotlin-android/src/main/java/net/taler/common/ContractTerms.kt b/taler-kotlin-android/src/main/java/net/taler/common/ContractTerms.kt
index 1f59d332..26a2cf4d 100644
--- a/taler-kotlin-android/src/main/java/net/taler/common/ContractTerms.kt
+++ b/taler-kotlin-android/src/main/java/net/taler/common/ContractTerms.kt
@@ -207,6 +207,13 @@ data class ContractProduct(
     override val image: String? = null,
     override val taxes: Set<Tax>? = null,
     val quantity: Int = 1,
+    /**
+     * Quantity as a decimal string (since merchant protocol v25), preferred over
+     * [quantity], which is only the legacy integer part.
+     */
+    @SerialName("unit_quantity")
+    val unitQuantity: String? = null,
+    val unit: String? = null,
 ) : OrderProduct() {
     val totalPrice: Amount? by lazy {
         price?.let { price * quantity }
diff --git a/wallet/src/main/java/net/taler/wallet/payment/PromptPaymentComposable.kt b/wallet/src/main/java/net/taler/wallet/payment/PromptPaymentComposable.kt
index 3663d1d3..6870388f 100644
--- a/wallet/src/main/java/net/taler/wallet/payment/PromptPaymentComposable.kt
+++ b/wallet/src/main/java/net/taler/wallet/payment/PromptPaymentComposable.kt
@@ -379,25 +379,38 @@ fun ProductItem(
                 Modifier.fillMaxWidth(),
                 horizontalAlignment = Alignment.End,
             ) {
-                // NAME
+                // NAME, prefixed with the quantity unless it is a single item
+                val name = product.productName?.takeIf { it.isNotBlank() }
+                    ?: product.localizedDescription
+                val quantity = (product.unitQuantity ?: product.quantity.toString()).let { q ->
+                    product.unit?.takeIf { it.isNotBlank() }?.let { "$q $it" } ?: q
+                }
                 Text(
-                    product.localizedDescription,
+                    if (quantity != "1") {
+                        stringResource(R.string.payment_product_price_quantity, quantity, name)
+                    } else {
+                        name
+                    },
                     modifier = Modifier.fillMaxWidth(),
                     style = MaterialTheme.typography.bodyLarge,
                 )
 
-                // PRICE
+                // DESCRIPTION, if the name did not already show it
+                if (name != product.localizedDescription) {
+                    Text(
+                        product.localizedDescription,
+                        modifier = Modifier.fillMaxWidth(),
+                        style = MaterialTheme.typography.bodyMedium.copy(
+                            color = ListItemDefaults.colors().supportingTextColor,
+                        ),
+                    )
+                }
+
+                // PRICE: the merchant already gives the total for this line
+                // (price of the quantity), it must not be multiplied again
                 product.price?.let { price ->
                     Text(
-                        if (product.quantity > 1) {
-                            stringResource(
-                                R.string.payment_product_price_quantity,
-                                product.quantity.toString(),
-                                price.toString(),
-                            )
-                        } else {
-                            price.toString()
-                        },
+                        price.toString(),
                         style = MaterialTheme.typography.bodyMedium.copy(
                             color = ListItemDefaults.colors().supportingTextColor,
                         ),