phone_sel = PhoneSelector(phones, campaign.phone_selection)
    rot = RotationAssigner(accounts, campaign.rotation_strategy, campaign.rotation_weights,
                           campaign.max_per_account)

    used_invoice_numbers: set = set()
    rows: List[CampaignRecipient] = []
    plan = []
    seq = 0
    for r in recipient_rows:
        seq += 1
        cr = CampaignRecipient(
            campaign_id=campaign.id,
            recipient_id=r.id,
            email=r.email,
            seq=seq,
        )
        # generated values
        g = GeneratedValues()
        if var_cfg.get("invoice_date"):
            g.invoice_date = var_cfg["invoice_date"]
        else:
            g.invoice_date = date.today().isoformat()
        if var_cfg.get("due_date"):
            g.due_date = var_cfg["due_date"]
        else:
            g.due_date = (date.today() + timedelta(days=int(var_cfg.get("due_days", 14)))).isoformat()
        inv_num = ""
        tpl = tpl_seq.next_template()
        if tpl is None and templates:
            cr.status = "skipped"
            cr.last_error = "Template sequence exhausted (mode=stop)"
        body_uses_invoice = any("%RandomInvoiceNumber%" in (t.body_html + (t.body_text or "")) for t in templates) or (tpl and "%RandomInvoiceNumber%" in tpl.body_html)
        if body_uses_invoice or var_cfg.get("always_generate_invoice", True):
            inv_num = engine.generate_invoice_number(used_invoice_numbers)
            used_invoice_numbers.add(inv_num)
        cr.generated_invoice_number = inv_num
        g.invoice_number = inv_num

        if var_cfg.get("amount_enabled", True) or body_uses_invoice:
            g.amount = engine.generate_amount()
            cr.generated_amount = g.amount
        if var_cfg.get("shipping_enabled", True) or "%RandomShippingCharge%" in (tpl.body_html if tpl else ""):
            g.shipping = engine.generate_shipping()
            cr.generated_shipping = g.shipping

        subj = subj_sel.next_subject()