feat(crm): allow updating invoice terms via oo

Needed to put issuer NIE in Bedingungen without a full recreate.

invoices.go

@@ -117,13 +117,15 @@ func (c *Client) CreateInvoice(ctx context.Context, p CreateInvoiceParams) (map[
 // UpdateInvoiceParams are fields for PUT /api/2.0/crm/invoice/{id}.
 // Loads the current invoice and merges non-zero / set fields.
 type UpdateInvoiceParams struct {
-	EntityID        int64 // link to opportunity; 0 = leave unchanged
-	EntityType      int
-	ContactID       int64  // 0 = leave unchanged
-	Description     string // invoice notes; empty + DescriptionSet=false keeps existing
-	DescriptionSet  bool
-	PurchaseOrder   string
+	EntityID         int64 // link to opportunity; 0 = leave unchanged
+	EntityType       int
+	ContactID        int64  // 0 = leave unchanged
+	Description      string // invoice notes; empty + DescriptionSet=false keeps existing
+	DescriptionSet   bool
+	PurchaseOrder    string
 	PurchaseOrderSet bool
+	Terms            string
+	TermsSet         bool
 }
 
 // UpdateInvoice PUTs a full invoice body (OnlyOffice requires complete payload).
@@ -206,6 +208,9 @@ func (c *Client) UpdateInvoice(ctx context.Context, id string, p UpdateInvoicePa
 	if p.PurchaseOrderSet {
 		body["purchaseOrderNumber"] = p.PurchaseOrder
 	}
+	if p.TermsSet {
+		body["terms"] = p.Terms
+	}
 	if p.EntityID != 0 {
 		body["entityId"] = p.EntityID
 		body["entityType"] = p.EntityType