diff --git a/CHANGELOG.md b/CHANGELOG.md
index 97723121..776495a1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,10 @@ Given a version number MAJOR.MINOR.PATCH, increment:
 
 
 ## [Unreleased]
+### Added
+- 'transactionIds' property to BoletoPayment and TaxPayment resources
+- 'fee', 'transactionIds', 'created' and 'updated' properties to DarfPayment resource
+- datetime validation to 'created' and 'updated' fields
 
 ## [2.9.2] - 2021-11-10
 ### Changed
diff --git a/sdk/balance/balance.js b/sdk/balance/balance.js
index 62273c7c..d46fa0e8 100644
--- a/sdk/balance/balance.js
+++ b/sdk/balance/balance.js
@@ -1,4 +1,5 @@
 const rest = require('../utils/rest.js');
+const check = require('../utils/check.js');
 const Resource = require('../utils/resource.js').Resource
 
 
@@ -23,7 +24,7 @@ class Balance extends Resource {
         super(id);
         this.amount = amount;
         this.currency = currency;
-        this.updated = updated;
+        this.updated = check.datetime(updated);
     }
 }
 
diff --git a/sdk/boleto/boleto.js b/sdk/boleto/boleto.js
index e889d0d7..faacf329 100644
--- a/sdk/boleto/boleto.js
+++ b/sdk/boleto/boleto.js
@@ -76,7 +76,7 @@ class Boleto extends Resource {
         this.barCode = barCode;
         this.status = status;
         this.transactionIds = transactionIds;
-        this.created = created;
+        this.created = check.datetime(created);
         this.ourNumber = ourNumber;
     }
 }
diff --git a/sdk/boleto/log/log.js b/sdk/boleto/log/log.js
index 47da5f18..28096d37 100644
--- a/sdk/boleto/log/log.js
+++ b/sdk/boleto/log/log.js
@@ -23,7 +23,7 @@ class Log extends Resource {
      */
     constructor({ created, type, errors, boleto, id }) {
         super(id);
-        this.created = check.date(created);
+        this.created = check.datetime(created);
         this.type = type;
         this.errors = errors;
         this.boleto = boleto;
diff --git a/sdk/boletoHolmes/boletoHolmes.js b/sdk/boletoHolmes/boletoHolmes.js
index 609e2e16..2f5aacdf 100644
--- a/sdk/boletoHolmes/boletoHolmes.js
+++ b/sdk/boletoHolmes/boletoHolmes.js
@@ -1,4 +1,5 @@
 const rest = require('../utils/rest.js');
+const check = require('../utils/check.js');
 const Resource = require('../utils/resource.js').Resource
 
 
@@ -33,8 +34,8 @@ class BoletoHolmes extends Resource {
         this.tags = tags;
         this.result = result;
         this.status = status;
-        this.created = created;
-        this.updated = updated;
+        this.created = check.datetime(created);
+        this.updated = check.datetime(updated);
     }
 }
 
diff --git a/sdk/boletoHolmes/log/log.js b/sdk/boletoHolmes/log/log.js
index 8afb1a47..4bfe2040 100644
--- a/sdk/boletoHolmes/log/log.js
+++ b/sdk/boletoHolmes/log/log.js
@@ -22,7 +22,7 @@ class Log extends Resource {
      */
     constructor({ created, type, holmes, id }) {
         super(id);
-        this.created = check.date(created);
+        this.created = check.datetime(created);
         this.type = type;
         this.holmes = holmes;
     }
diff --git a/sdk/boletoPayment/boletoPayment.js b/sdk/boletoPayment/boletoPayment.js
index e17f91cd..185565a4 100644
--- a/sdk/boletoPayment/boletoPayment.js
+++ b/sdk/boletoPayment/boletoPayment.js
@@ -28,11 +28,12 @@ class BoletoPayment extends Resource {
      * Attributes (return-only):
      * @param id [string, default null]: unique id returned when payment is created. ex: '5656565656565656'
      * @param status [string, default null]: current payment status. ex: 'success' or 'failed'
+     * @param transactionIds [list of strings, default null]: ledger transaction ids linked to this BoletoPayment. ex: ['19827356981273']
      * @param fee [integer, default null]: fee charged when boleto payment is created. ex: 200 (= R$ 2.00)
      * @param created [string, default null]: creation datetime for the payment. ex: '2020-03-10 10:30:00.000'
      *
      */
-    constructor({ taxId, description, scheduled, line, barCode, tags, id, status, amount, fee, created }) {
+    constructor({ taxId, description, scheduled, line, barCode, tags, id, status, amount, transactionIds, fee, created }) {
         super(id);
         this.taxId = taxId;
         this.description = description;
@@ -42,8 +43,9 @@ class BoletoPayment extends Resource {
         this.tags = tags;
         this.status = status;
         this.amount = amount;
+        this.transactionIds = transactionIds;
         this.fee = fee;
-        this.created = created;
+        this.created = check.datetime(created);
     }
 }
 
diff --git a/sdk/boletoPayment/log/log.js b/sdk/boletoPayment/log/log.js
index 7c8ab553..80559da9 100644
--- a/sdk/boletoPayment/log/log.js
+++ b/sdk/boletoPayment/log/log.js
@@ -1,4 +1,5 @@
 const rest = require('../../utils/rest.js');
+const check = require('../../utils/check.js');
 const Resource = require('../../utils/resource.js').Resource
 
 
@@ -22,7 +23,7 @@ class Log extends Resource {
      */
     constructor({ created, type, errors, payment, id }) {
         super(id);
-        this.created = created;
+        this.created = check.datetime(created);
         this.type = type;
         this.errors = errors;
         this.payment = payment;
diff --git a/sdk/brcodePayment/brcodePayment.js b/sdk/brcodePayment/brcodePayment.js
index c2e3690d..2bdffecd 100644
--- a/sdk/brcodePayment/brcodePayment.js
+++ b/sdk/brcodePayment/brcodePayment.js
@@ -47,8 +47,8 @@ class BrcodePayment extends Resource {
       this.status = status;
       this.type = type;
       this.fee = fee;
-      this.updated = check.date(updated);
-      this.created = check.date(created);
+      this.updated = check.datetime(updated);
+      this.created = check.datetime(created);
     }
 }
 
diff --git a/sdk/brcodePayment/log/log.js b/sdk/brcodePayment/log/log.js
index 5d3fc816..1618cf8c 100644
--- a/sdk/brcodePayment/log/log.js
+++ b/sdk/brcodePayment/log/log.js
@@ -23,7 +23,7 @@ class Log extends Resource {
    */
   constructor({ created, type, errors, payment, id }) {
       super(id);
-      this.created = check.date(created);
+      this.created = check.datetime(created);
       this.type = type;
       this.errors = errors;
       this.payment = payment;
diff --git a/sdk/darfPayment/darfPayment.js b/sdk/darfPayment/darfPayment.js
index 9e67427a..6071b749 100644
--- a/sdk/darfPayment/darfPayment.js
+++ b/sdk/darfPayment/darfPayment.js
@@ -4,9 +4,43 @@ const Resource = require('../utils/resource').Resource;
 
 class DarfPayment extends Resource {
 
+        /**
+     *
+     * TaxPayment object
+     *
+     * @description When you initialize a DarfPayment, the entity will not be automatically
+     * created in the Stark Bank API. The 'create' function sends the objects
+     * to the Stark Bank API and returns the list of created objects.
+     * 
+     * Parameters (required):
+     * @param description [string]: Text to be displayed in your statement (min. 10 characters). ex: "payment ABC"
+     * @param revenueCode [string]: 4-digit tax code assigned by Federal Revenue. ex: "5948"
+     * @param taxId [string]: tax id (formatted or unformatted) of the payer. ex: "12.345.678/0001-95"
+     * @param competence [string]: competence month of the service. ex: ex: '2020-03-10'
+     * @param nominalAmount [int]: amount due in cents without fee or interest. ex: 23456 (= R$ 234.56)
+     * @param fineAmount [int]: fixed amount due in cents for fines. ex: 234 (= R$ 2.34)
+     * @param interestAmount [int]: amount due in cents for interest. ex: 456 (= R$ 4.56)
+     * @param due [string]: due date for payment. ex: ex: '2020-03-10'
+     *
+     * Parameters (optional):
+     * @param referenceNumber [string]: number assigned to the region of the tax. ex: "08.1.17.00-4"
+     * @param scheduled [string, default today]: payment scheduled date. ex: '2020-03-10'
+     * @param tags [list of strings]: list of strings for tagging
+     *
+     * Attributes (return-only):
+     * @param id [string, default null]: unique id returned when payment is created. ex: "5656565656565656"
+     * @param status [string, default null]: current payment status. ex: "success" or "failed"
+     * @param amount [int, default null]: Total amount due calculated from other amounts. ex: 24146 (= R$ 241.46)
+     * @param fee [integer, default null]: fee charged when the DarfPayment is processed. ex: 0 (= R$ 0.00)
+     * @param transactionIds [list of strings, default null]: ledger transaction ids linked to this DarfPayment. ex: ['19827356981273']
+     * @param updated [string, default null]: latest update datetime for the payment. ex: '2020-03-10 10:30:00.000'
+     * @param created [string, default null]: creation datetime for the payment. ex: '2020-03-10 10:30:00.000'
+     *
+     */
     constructor({
         revenueCode, taxId, competence, referenceNumber, fineAmount, interestAmount,
-        due, description, tags, scheduled, status, amount, nominalAmount, id
+        due, description, tags, scheduled, status, amount, nominalAmount, fee, 
+        transactionIds, updated, created, id
     }) {
         super(id);
         this.revenueCode = revenueCode;
@@ -22,6 +56,10 @@ class DarfPayment extends Resource {
         this.status = status;
         this.amount = amount;
         this.nominalAmount = nominalAmount;
+        this.transactionIds = transactionIds;
+        this.fee = fee;
+        this.updated = check.datetime(updated);
+        this.created = check.datetime(created);
     }
 }
 
diff --git a/sdk/darfPayment/log/log.js b/sdk/darfPayment/log/log.js
index a81323d0..a32f23e6 100644
--- a/sdk/darfPayment/log/log.js
+++ b/sdk/darfPayment/log/log.js
@@ -23,7 +23,7 @@ class Log extends Resource {
      */
     constructor({ created, type, errors, payment, id }) {
         super(id);
-        this.created = check.date(created);
+        this.created = check.datetime(created);
         this.type = type;
         this.errors = errors;
         this.payment = payment;
diff --git a/sdk/deposit/deposit.js b/sdk/deposit/deposit.js
index 7efee25b..67cfc831 100644
--- a/sdk/deposit/deposit.js
+++ b/sdk/deposit/deposit.js
@@ -1,4 +1,5 @@
 const rest = require('../utils/rest.js');
+const check = require('../utils/check.js');
 const Resource = require('../utils/resource.js').Resource;
 
 
@@ -43,8 +44,8 @@ class Deposit extends Resource {
         this.tags = tags;
         this.fee = fee;
         this.transactionIds = transactionIds;
-        this.created = created;
-        this.updated = updated;
+        this.created = check.datetime(created);
+        this.updated = check.datetime(updated);
     }
 }
 
diff --git a/sdk/deposit/log/log.js b/sdk/deposit/log/log.js
index a88a1ab0..09884cd5 100644
--- a/sdk/deposit/log/log.js
+++ b/sdk/deposit/log/log.js
@@ -23,7 +23,7 @@ class Log extends Resource {
      */
     constructor({ created, type, errors, boleto, id }) {
         super(id);
-        this.created = check.date(created);
+        this.created = check.datetime(created);
         this.type = type;
         this.errors = errors;
         this.boleto = boleto;
diff --git a/sdk/event/attempt/attempt.js b/sdk/event/attempt/attempt.js
index ed8c9f46..a94b5eed 100644
--- a/sdk/event/attempt/attempt.js
+++ b/sdk/event/attempt/attempt.js
@@ -1,4 +1,5 @@
 const Resource = require('../../utils/resource.js').Resource;
+const check = require('../../utils/check.js');
 const rest = require('../../utils/rest.js');
 
 
@@ -10,7 +11,7 @@ class Attempt extends Resource {
         this.message = message;
         this.webhookId = webhookId;
         this.eventId = eventId;
-        this.created = created;
+        this.created = check.datetime(created);
     }
 }
 
diff --git a/sdk/event/event.js b/sdk/event/event.js
index 468b5317..15e9e39a 100644
--- a/sdk/event/event.js
+++ b/sdk/event/event.js
@@ -27,7 +27,7 @@ class Event extends Resource {
     constructor({created, isDelivered, subscription, log, id, workspaceId} = {}) {
         super(id);
         this.log = log;
-        this.created = created;
+        this.created = check.datetime(created);
         this.isDelivered = isDelivered;
         this.subscription = subscription;
         this.workspaceId = workspaceId;
diff --git a/sdk/invoice/invoice.js b/sdk/invoice/invoice.js
index 3cb06c38..cfacb6ef 100644
--- a/sdk/invoice/invoice.js
+++ b/sdk/invoice/invoice.js
@@ -74,8 +74,8 @@ class Invoice extends Resource {
         this.brcode = brcode;
         this.status = status;
         this.transactionIds = transactionIds;
-        this.created = check.date(created);
-        this.updated = check.date(updated);
+        this.created = check.datetime(created);
+        this.updated = check.datetime(updated);
     }
 }
 
diff --git a/sdk/invoice/log/log.js b/sdk/invoice/log/log.js
index cd016e74..5d73d394 100644
--- a/sdk/invoice/log/log.js
+++ b/sdk/invoice/log/log.js
@@ -23,7 +23,7 @@ class Log extends Resource {
      */
     constructor({ created, type, errors, invoice, id }) {
         super(id);
-        this.created = check.date(created);
+        this.created = check.datetime(created);
         this.type = type;
         this.errors = errors;
         this.invoice = invoice;
diff --git a/sdk/paymentRequest/paymentRequest.js b/sdk/paymentRequest/paymentRequest.js
index df7e2832..1389bd43 100644
--- a/sdk/paymentRequest/paymentRequest.js
+++ b/sdk/paymentRequest/paymentRequest.js
@@ -4,12 +4,13 @@ const { Transfer } = require('../transfer/transfer.js');
 const { UtilityPayment } = require('../utilityPayment/utilityPayment.js');
 const { BrcodePayment } = require('../brcodePayment/brcodePayment.js');
 const rest = require('../utils/rest.js');
+const check = require('../utils/check.js');
 const Resource = require('../utils/resource.js').Resource
 
 
 class PaymentRequest extends Resource {
 
-     /**
+    /**
      * PaymentRequest constructor
      *
      * A PaymentRequest is an indirect request to access a specific cash-out service
@@ -48,8 +49,8 @@ class PaymentRequest extends Resource {
         this.amount = amount;
         this.status = status;
         this.actions = actions;
-        this.updated = updated;
-        this.created = created;
+        this.updated = check.datetime(updated);
+        this.created = check.datetime(created);
         let parsePaymentObject = parsePayment(payment, type);
         this.payment = parsePaymentObject['payment'];
         this.type = parsePaymentObject['type'];
diff --git a/sdk/taxPayment/log/log.js b/sdk/taxPayment/log/log.js
index 779f2b86..6f8db779 100644
--- a/sdk/taxPayment/log/log.js
+++ b/sdk/taxPayment/log/log.js
@@ -1,4 +1,5 @@
 const rest = require('../../utils/rest.js');
+const check = require('../../utils/check.js');
 const Resource = require('../../utils/resource.js').Resource
 
 
@@ -19,9 +20,9 @@ class Log extends Resource {
      * @param created [string]: creation datetime for the log. ex: '2020-03-10 10:30:00.000'
      *
      */
-    constructor(created, type, errors, payment, id = null) {
+    constructor({ created, type, errors, payment, id = null }) {
         super(id);
-        this.created = created;
+        this.created = check.datetime(created);
         this.type = type;
         this.errors = errors;
         this.payment = payment;
diff --git a/sdk/taxPayment/taxPayment.js b/sdk/taxPayment/taxPayment.js
index c5a4cd54..c2352c65 100644
--- a/sdk/taxPayment/taxPayment.js
+++ b/sdk/taxPayment/taxPayment.js
@@ -29,13 +29,14 @@ class TaxPayment extends Resource {
      * @param status [string, default null]: current payment status. ex: 'success' or 'failed'
      * @param amount [int, default null]: amount automatically calculated from line or bar_code. ex: 23456 (= R$ 234.56)
      * @param fee [integer, default null]: fee charged when the tax payment is created. ex: 200 (= R$ 2.00)
+     * @param transactionIds [list of strings, default null]: ledger transaction ids linked to this TaxPayment. ex: ['19827356981273']
      * @param updated [string, default null]: latest update datetime for the payment. ex: '2020-03-10 10:30:00.000'
      * @param created [string, default null]: creation datetime for the payment. ex: '2020-03-10 10:30:00.000'
      *
      */
     constructor({
                     description, scheduled, line, barCode, tags, 
-                    amount, status, type, updated, created, fee, id,
+                    amount, status, type, transactionIds, updated, created, fee, id,
                 })  {
         super(id);
         this.barCode = barCode;
@@ -46,8 +47,9 @@ class TaxPayment extends Resource {
         this.amount = amount;
         this.status = status;
         this.type = type;
-        this.updated = updated;
-        this.created = created;
+        this.transactionIds = transactionIds;
+        this.updated = check.datetime(updated);
+        this.created = check.datetime(created);
         this.fee = fee;
     }
 }
diff --git a/sdk/transaction/transaction.js b/sdk/transaction/transaction.js
index 59dc83a9..bbb0c27a 100644
--- a/sdk/transaction/transaction.js
+++ b/sdk/transaction/transaction.js
@@ -1,4 +1,5 @@
 const rest = require('../utils/rest.js');
+const check = require('../utils/check.js');
 const Resource = require('../utils/resource.js').Resource
 
 
@@ -44,7 +45,7 @@ class Transaction extends Resource {
         this.fee = fee;
         this.source = source;
         this.balance = balance;
-        this.created = created;
+        this.created = check.datetime(created);
     }
 }
 
diff --git a/sdk/transfer/log/log.js b/sdk/transfer/log/log.js
index 4e438bc9..84dea7a3 100644
--- a/sdk/transfer/log/log.js
+++ b/sdk/transfer/log/log.js
@@ -1,4 +1,5 @@
 const rest = require('../../utils/rest.js');
+const check = require('../../utils/check.js');
 const Resource = require('../../utils/resource.js').Resource
 
 
@@ -21,7 +22,7 @@ class Log extends Resource {
      */
     constructor({ created, type, errors, transfer, id }) {
         super(id);
-        this.created = created;
+        this.created = check.datetime(created);
         this.type = type;
         this.errors = errors;
         this.transfer = transfer;
diff --git a/sdk/transfer/transfer.js b/sdk/transfer/transfer.js
index 20c51e65..fd58c072 100644
--- a/sdk/transfer/transfer.js
+++ b/sdk/transfer/transfer.js
@@ -54,8 +54,8 @@ class Transfer extends Resource {
         this.tags = tags;
         this.fee = fee;
         this.status = status;
-        this.created = created;
-        this.updated = updated;
+        this.created = check.datetime(created);
+        this.updated = check.datetime(updated);
         this.transactionIds = transactionIds;
     }
 }
diff --git a/sdk/utilityPayment/log/log.js b/sdk/utilityPayment/log/log.js
index e8584d7b..57a250a7 100644
--- a/sdk/utilityPayment/log/log.js
+++ b/sdk/utilityPayment/log/log.js
@@ -1,4 +1,5 @@
 const rest = require('../../utils/rest.js');
+const check = require('../../utils/check.js');
 const Resource = require('../../utils/resource.js').Resource
 
 
@@ -19,9 +20,9 @@ class Log extends Resource {
      * @param created [string]: creation datetime for the log. ex: '2020-03-10 10:30:00.000'
      *
      */
-    constructor(created, type, errors, payment, id = null) {
+    constructor({ created, type, errors, payment, id = null }) {
         super(id);
-        this.created = created;
+        this.created = check.datetime(created);
         this.type = type;
         this.errors = errors;
         this.payment = payment;
diff --git a/sdk/utilityPayment/utilityPayment.js b/sdk/utilityPayment/utilityPayment.js
index 486aac6d..9f5b7d14 100644
--- a/sdk/utilityPayment/utilityPayment.js
+++ b/sdk/utilityPayment/utilityPayment.js
@@ -44,7 +44,7 @@ class UtilityPayment extends Resource {
         this.tags = tags;
         this.amount = amount;
         this.status = status;
-        this.created = created;
+        this.created = check.datetime(created);
         this.fee = fee;
     }
 }