diff --git a/erpnext/hr/doctype/salary_slip/salary_slip.py b/erpnext/hr/doctype/salary_slip/salary_slip.py
index bee28180187..d644ff43691 100644
--- a/erpnext/hr/doctype/salary_slip/salary_slip.py
+++ b/erpnext/hr/doctype/salary_slip/salary_slip.py
@@ -696,7 +696,7 @@ class SalarySlip(TransactionBase):
 
 		# apply rounding
 		if frappe.get_cached_value("Salary Component", row.salary_component, "round_to_the_nearest_integer"):
-			amount, additional_amount = rounded(amount), rounded(additional_amount)
+			amount, additional_amount = rounded(amount or 0), rounded(additional_amount or 0)
 
 		return amount, additional_amount
 
diff --git a/erpnext/regional/doctype/e_invoice_settings/e_invoice_settings.json b/erpnext/regional/doctype/e_invoice_settings/e_invoice_settings.json
index db8bda75bfd..0cc5799801d 100644
--- a/erpnext/regional/doctype/e_invoice_settings/e_invoice_settings.json
+++ b/erpnext/regional/doctype/e_invoice_settings/e_invoice_settings.json
@@ -9,6 +9,10 @@
   "section_break_2",
   "sandbox_mode",
   "credentials",
+  "advanced_settings_section",
+  "client_id",
+  "column_break_8",
+  "client_secret",
   "auth_token",
   "token_expiry"
  ],
@@ -48,12 +52,32 @@
    "fieldname": "sandbox_mode",
    "fieldtype": "Check",
    "label": "Sandbox Mode"
+  },
+  {
+   "collapsible": 1,
+   "fieldname": "advanced_settings_section",
+   "fieldtype": "Section Break",
+   "label": "Advanced Settings"
+  },
+  {
+   "fieldname": "client_id",
+   "fieldtype": "Data",
+   "label": "Client ID"
+  },
+  {
+   "fieldname": "client_secret",
+   "fieldtype": "Password",
+   "label": "Client Secret"
+  },
+  {
+   "fieldname": "column_break_8",
+   "fieldtype": "Column Break"
   }
  ],
  "index_web_pages_for_search": 1,
  "issingle": 1,
  "links": [],
- "modified": "2021-01-13 12:04:49.449199",
+ "modified": "2021-11-16 19:50:28.029517",
  "modified_by": "Administrator",
  "module": "Regional",
  "name": "E Invoice Settings",
diff --git a/erpnext/regional/india/e_invoice/einv_item_template.json b/erpnext/regional/india/e_invoice/einv_item_template.json
index 78e56518dff..2c04c6dcf4d 100644
--- a/erpnext/regional/india/e_invoice/einv_item_template.json
+++ b/erpnext/regional/india/e_invoice/einv_item_template.json
@@ -23,9 +23,5 @@
     "StateCesAmt": "{item.state_cess_amount}",
     "StateCesNonAdvlAmt": "{item.state_cess_nadv_amount}",
     "OthChrg": "{item.other_charges}",
-    "TotItemVal": "{item.total_value}",
-    "BchDtls": {{
-        "Nm": "{item.batch_no}",
-        "ExpDt": "{item.batch_expiry_date}"
-    }}
+    "TotItemVal": "{item.total_value}"
 }}
\ No newline at end of file
diff --git a/erpnext/regional/india/e_invoice/utils.py b/erpnext/regional/india/e_invoice/utils.py
index f788ce9a8d5..69abfcfaac2 100644
--- a/erpnext/regional/india/e_invoice/utils.py
+++ b/erpnext/regional/india/e_invoice/utils.py
@@ -200,8 +200,6 @@ def get_item_list(invoice):
 		item.taxable_value = abs(item.taxable_value)
 		item.discount_amount = 0
 
-		item.batch_expiry_date = frappe.db.get_value('Batch', d.batch_no, 'expiry_date') if d.batch_no else None
-		item.batch_expiry_date = format_date(item.batch_expiry_date, 'dd/mm/yyyy') if item.batch_expiry_date else None
 		item.is_service_item = 'Y' if item.gst_hsn_code and item.gst_hsn_code[:2] == "99" else 'N'
 		item.serial_no = ""
 
@@ -462,7 +460,11 @@ def make_einvoice(invoice):
 	except Exception:
 		show_link_to_error_log(invoice, einvoice)
 
-	validate_totals(einvoice)
+	try:
+		validate_totals(einvoice)
+	except Exception:
+		log_error(einvoice)
+		raise
 
 	return einvoice
 
@@ -611,10 +613,17 @@ class GSPConnector():
 		request_log.save(ignore_permissions=True)
 		frappe.db.commit()
 
+	def get_client_credentials(self):
+		if self.e_invoice_settings.client_id and self.e_invoice_settings.client_secret:
+			return self.e_invoice_settings.client_id, self.e_invoice_settings.get_password('client_secret')
+
+		return frappe.conf.einvoice_client_id, frappe.conf.einvoice_client_secret
+
 	def fetch_auth_token(self):
+		client_id, client_secret = self.get_client_credentials()
 		headers = {
-			'gspappid': frappe.conf.einvoice_client_id,
-			'gspappsecret': frappe.conf.einvoice_client_secret
+			'gspappid': client_id,
+			'gspappsecret': client_secret
 		}
 		res = {}
 		try:
@@ -854,7 +863,7 @@ class GSPConnector():
 		if errors:
 			throw_error_list(errors, title)
 		else:
-			link_to_error_list = '<a href="desk#List/Error Log/List?method=E Invoice Request Failed">Error Log</a>'
+			link_to_error_list = '<a href="desk#List/Error Log/List?method=E Invoice Request Failed" target="_blank">Error Log</a>'
 			frappe.msgprint(
 				_('An error occurred while making e-invoicing request. Please check {} for more information.').format(link_to_error_list),
 				title=title,