feat: currency exchange settings
diff --git a/erpnext/setup/doctype/currency_exchange_settings/__init__.py b/erpnext/setup/doctype/currency_exchange_settings/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/erpnext/setup/doctype/currency_exchange_settings/__init__.py
diff --git a/erpnext/setup/doctype/currency_exchange_settings/currency_exchange_settings.js b/erpnext/setup/doctype/currency_exchange_settings/currency_exchange_settings.js
new file mode 100644
index 0000000..6b0ccb7
--- /dev/null
+++ b/erpnext/setup/doctype/currency_exchange_settings/currency_exchange_settings.js
@@ -0,0 +1,8 @@
+// Copyright (c) 2021, Wahni Green Technologies Pvt. Ltd. and contributors
+// For license information, please see license.txt
+
+frappe.ui.form.on('Currency Exchange Settings', {
+	// refresh: function(frm) {
+
+	// }
+});
diff --git a/erpnext/setup/doctype/currency_exchange_settings/currency_exchange_settings.json b/erpnext/setup/doctype/currency_exchange_settings/currency_exchange_settings.json
new file mode 100644
index 0000000..b010437
--- /dev/null
+++ b/erpnext/setup/doctype/currency_exchange_settings/currency_exchange_settings.json
@@ -0,0 +1,86 @@
+{
+ "actions": [],
+ "creation": "2021-09-02 14:53:50.923529",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "api_details_section",
+  "api_endpoint",
+  "column_break_3",
+  "result_key",
+  "section_break_2",
+  "req_params",
+  "column_break_4",
+  "extra_params"
+ ],
+ "fields": [
+  {
+   "fieldname": "api_endpoint",
+   "fieldtype": "Data",
+   "in_list_view": 1,
+   "label": "API Endpoint",
+   "reqd": 1
+  },
+  {
+   "fieldname": "section_break_2",
+   "fieldtype": "Section Break",
+   "label": "Request Parameters"
+  },
+  {
+   "fieldname": "column_break_4",
+   "fieldtype": "Column Break"
+  },
+  {
+   "fieldname": "req_params",
+   "fieldtype": "Table",
+   "label": "Mandatory Parameters",
+   "options": "Currency Exchange Settings Details",
+   "reqd": 1
+  },
+  {
+   "fieldname": "extra_params",
+   "fieldtype": "Table",
+   "label": "Additional Parameters",
+   "options": "Currency Exchange Settings Extra Details"
+  },
+  {
+   "fieldname": "api_details_section",
+   "fieldtype": "Section Break",
+   "label": "API Details"
+  },
+  {
+   "fieldname": "column_break_3",
+   "fieldtype": "Column Break"
+  },
+  {
+   "fieldname": "result_key",
+   "fieldtype": "Data",
+   "label": "Result Key",
+   "reqd": 1
+  }
+ ],
+ "index_web_pages_for_search": 1,
+ "issingle": 1,
+ "links": [],
+ "modified": "2021-09-02 15:18:29.198210",
+ "modified_by": "Administrator",
+ "module": "Setup",
+ "name": "Currency Exchange Settings",
+ "owner": "Administrator",
+ "permissions": [
+  {
+   "create": 1,
+   "delete": 1,
+   "email": 1,
+   "print": 1,
+   "read": 1,
+   "role": "System Manager",
+   "share": 1,
+   "write": 1
+  }
+ ],
+ "sort_field": "modified",
+ "sort_order": "DESC",
+ "track_changes": 1
+}
\ No newline at end of file
diff --git a/erpnext/setup/doctype/currency_exchange_settings/currency_exchange_settings.py b/erpnext/setup/doctype/currency_exchange_settings/currency_exchange_settings.py
new file mode 100644
index 0000000..b726d75
--- /dev/null
+++ b/erpnext/setup/doctype/currency_exchange_settings/currency_exchange_settings.py
@@ -0,0 +1,38 @@
+# Copyright (c) 2021, Wahni Green Technologies Pvt. Ltd. and contributors
+# For license information, please see license.txt
+
+import frappe
+from frappe import _
+from frappe.model.document import Document
+
+class CurrencyExchangeSettings(Document):
+	def validate(self):
+		if len(self.req_params) != 3:
+			frappe.throw(_("Make sure all the three mandatory parameters are filled."))
+		req_params = {
+			'transaction_date': '2021-08-01',
+			'from_currency': 'USD',
+			'to_currency': 'INR'
+		}
+		params = {}
+		for row in self.req_params:
+			try:
+				params[row.key] = req_params[row.value]
+				req_params.pop(row.value)
+			except:
+				frappe.throw(_("Make sure all the three mandatory parameters are filled."))
+		import requests
+		api_url = self.api_endpoint
+		try:
+			response = requests.get(api_url, params=params)
+		except requests.exceptions.RequestException as e:
+			frappe.throw("Error: " + str(e))
+		response.raise_for_status()
+		value = response.json()
+		try:
+			rate = value[str(self.result_key)]
+		except KeyError:
+			frappe.throw(_("Invalid result key."))
+		if not isinstance(rate, (int, float)):
+			frappe.throw(_("Returned exchange rate is neither integer not float."))
+		frappe.msgprint(_("Exchange rate of USD to INR on 01-08-2021 is ") + str(rate))
diff --git a/erpnext/setup/doctype/currency_exchange_settings/test_currency_exchange_settings.py b/erpnext/setup/doctype/currency_exchange_settings/test_currency_exchange_settings.py
new file mode 100644
index 0000000..80a9a17
--- /dev/null
+++ b/erpnext/setup/doctype/currency_exchange_settings/test_currency_exchange_settings.py
@@ -0,0 +1,8 @@
+# Copyright (c) 2021, Frappe Technologies Pvt. Ltd. and Contributors
+# See license.txt
+
+# import frappe
+import unittest
+
+class TestCurrencyExchangeSettings(unittest.TestCase):
+	pass
diff --git a/erpnext/setup/doctype/currency_exchange_settings_details/__init__.py b/erpnext/setup/doctype/currency_exchange_settings_details/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/erpnext/setup/doctype/currency_exchange_settings_details/__init__.py
diff --git a/erpnext/setup/doctype/currency_exchange_settings_details/currency_exchange_settings_details.json b/erpnext/setup/doctype/currency_exchange_settings_details/currency_exchange_settings_details.json
new file mode 100644
index 0000000..9d49daa
--- /dev/null
+++ b/erpnext/setup/doctype/currency_exchange_settings_details/currency_exchange_settings_details.json
@@ -0,0 +1,40 @@
+{
+ "actions": [],
+ "creation": "2021-09-02 14:54:49.033512",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "key",
+  "value"
+ ],
+ "fields": [
+  {
+   "fieldname": "key",
+   "fieldtype": "Data",
+   "in_list_view": 1,
+   "label": "Key",
+   "reqd": 1
+  },
+  {
+   "fieldname": "value",
+   "fieldtype": "Select",
+   "in_list_view": 1,
+   "label": "Value",
+   "options": "\ntransaction_date\nfrom_currency\nto_currency",
+   "reqd": 1
+  }
+ ],
+ "index_web_pages_for_search": 1,
+ "istable": 1,
+ "links": [],
+ "modified": "2021-09-02 15:24:24.675019",
+ "modified_by": "Administrator",
+ "module": "Setup",
+ "name": "Currency Exchange Settings Details",
+ "owner": "Administrator",
+ "permissions": [],
+ "sort_field": "modified",
+ "sort_order": "DESC",
+ "track_changes": 1
+}
\ No newline at end of file
diff --git a/erpnext/setup/doctype/currency_exchange_settings_details/currency_exchange_settings_details.py b/erpnext/setup/doctype/currency_exchange_settings_details/currency_exchange_settings_details.py
new file mode 100644
index 0000000..f870b11
--- /dev/null
+++ b/erpnext/setup/doctype/currency_exchange_settings_details/currency_exchange_settings_details.py
@@ -0,0 +1,8 @@
+# Copyright (c) 2021, Wahni Green Technologies Pvt. Ltd. and contributors
+# For license information, please see license.txt
+
+# import frappe
+from frappe.model.document import Document
+
+class CurrencyExchangeSettingsDetails(Document):
+	pass
diff --git a/erpnext/setup/doctype/currency_exchange_settings_extra_details/__init__.py b/erpnext/setup/doctype/currency_exchange_settings_extra_details/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/erpnext/setup/doctype/currency_exchange_settings_extra_details/__init__.py
diff --git a/erpnext/setup/doctype/currency_exchange_settings_extra_details/currency_exchange_settings_extra_details.json b/erpnext/setup/doctype/currency_exchange_settings_extra_details/currency_exchange_settings_extra_details.json
new file mode 100644
index 0000000..fb85bb1
--- /dev/null
+++ b/erpnext/setup/doctype/currency_exchange_settings_extra_details/currency_exchange_settings_extra_details.json
@@ -0,0 +1,39 @@
+{
+ "actions": [],
+ "creation": "2021-09-02 15:18:17.888667",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "key",
+  "value"
+ ],
+ "fields": [
+  {
+   "fieldname": "key",
+   "fieldtype": "Data",
+   "in_list_view": 1,
+   "label": "Key",
+   "reqd": 1
+  },
+  {
+   "fieldname": "value",
+   "fieldtype": "Data",
+   "in_list_view": 1,
+   "label": "Value",
+   "reqd": 1
+  }
+ ],
+ "index_web_pages_for_search": 1,
+ "istable": 1,
+ "links": [],
+ "modified": "2021-09-02 15:18:17.888667",
+ "modified_by": "Administrator",
+ "module": "Setup",
+ "name": "Currency Exchange Settings Extra Details",
+ "owner": "Administrator",
+ "permissions": [],
+ "sort_field": "modified",
+ "sort_order": "DESC",
+ "track_changes": 1
+}
\ No newline at end of file
diff --git a/erpnext/setup/doctype/currency_exchange_settings_extra_details/currency_exchange_settings_extra_details.py b/erpnext/setup/doctype/currency_exchange_settings_extra_details/currency_exchange_settings_extra_details.py
new file mode 100644
index 0000000..ee51533
--- /dev/null
+++ b/erpnext/setup/doctype/currency_exchange_settings_extra_details/currency_exchange_settings_extra_details.py
@@ -0,0 +1,8 @@
+# Copyright (c) 2021, Wahni Green Technologies Pvt. Ltd. and contributors
+# For license information, please see license.txt
+
+# import frappe
+from frappe.model.document import Document
+
+class CurrencyExchangeSettingsExtraDetails(Document):
+	pass