diff --git a/package.json b/package.json
index 8c77e93..46bf993 100644
--- a/package.json
+++ b/package.json
@@ -2,6 +2,7 @@
   "name": "paystack-api",
   "version": "2.0.6",
   "main": "index.js",
+  "types": "./types/index.d.ts",
   "license": "MIT",
   "dependencies": {
     "mitt": "^1.1.3",
diff --git a/types/index.d.ts b/types/index.d.ts
new file mode 100644
index 0000000..7ec1938
--- /dev/null
+++ b/types/index.d.ts
@@ -0,0 +1,114 @@
+// types/index.d.ts
+
+/// <reference path="interfaces.d.ts" />
+
+declare module "paystack-api" {
+  interface API {
+    plan: PlanResource;
+    page: PaymentPageResource;
+    customer: CustomerResource;
+    control_panel: ControlPanelResource;
+    transfer_control: TransferControlResource;
+    transfer_recipient: TransferRecipientResource;
+    refund: RefundResource;
+    settlement: SettlementResource;
+    subaccount: SubaccountResource;
+    charge: ChargeResource;
+    bulk_charge: BulkChargeResource;
+    invoice: InvoiceResource;
+  }
+
+  export default function Paystack(secretKey: string): API;
+
+  class PlanResource {
+    get(options: GetPlanOptions): Promise<Object>;
+    list(options: ListPlansOptions): Promise<Object>;
+    create(options: CreatePlanOptions): Promise<Object>;
+    update(options: UpdatePlanOptions): Promise<Object>;
+  }
+
+  class CustomerResource {
+    get(options: GetCustomerOptions): Promise<Object>;
+    list(options: ListCustomersOptions): Promise<Object>;
+    create(options: CreateCustomerOptions): Promise<Object>;
+    update(options: UpdateCustomerOptions): Promise<Object>;
+    validate(options: ValidateCustomerOptions): Promise<Object>;
+    setRiskAction(options: SetCustomerRiskActionOptions): Promise<Object>;
+    deactivateAuth(options: DeactivateCustomerAuthOptions): Promise<Object>;
+  }
+
+  class PaymentPageResource {
+    get(options: GetPaymentPageOptions): Promise<Object>;
+    list(options: ListPaymentPagesOptions): Promise<Object>;
+    create(options: CreatePaymentPageOptions): Promise<Object>;
+    update(options: UpdatePaymentPageOptions): Promise<Object>;
+    slugAvailable(options: CheckSlugAvailablilityOptions): Promise<Object>;
+  }
+
+  class ControlPanelResource {
+    getSessionTimeout(): Promise<Object>;
+    updeteSessionTimeout(options: UpdateSessionTimeoutOptions): Promise<Object>;
+  }
+
+  class SettlementResource {
+    list(options: ListSettlementOptions): Promise<Object>;
+  }
+
+  class TransferControlResource {
+    balance(): Promise<Object>;
+    enableOTP(): Promise<Object>;
+    disableOTP(): Promise<Object>;
+    resendOTP(options: ResendOTPOptions): Promise<Object>;
+    finalizeDisableOTP(options: FinalizeDisableOTPOptions): Promise<Object>;
+  }
+
+  class TransferRecipientResource {
+    list(options: ListTransferRecipientOptions): Promise<Object>;
+    create(options: CreateTransferRecipientOptions): Promise<Object>;
+    update(options: UpdateTransferRecipientOptions): Promise<Object>;
+    remove(options: RemoveTransferRecipientOptions): Promise<Object>;
+  }
+
+  class RefundResource {
+    get(options: GetRefundOptions): Promise<Object>;
+    list(options: ListRefundsOptions): Promise<Object>;
+    create(options: CreateRefundOptions): Promise<Object>;
+  }
+
+  class SubaccountResource {
+    get(options: GetSubaccountOptions): Promise<Object>;
+    list(options: ListSubaccountOptions): Promise<Object>;
+    create(options: CreateSubaccountOptions): Promise<Object>;
+    update(options: UpdateSubaccountOptions): Promise<Object>;
+  }
+
+  class ChargeResource {
+    charge(options: CreateChargeOptions): Promise<Object>;
+    submitPIN(options: SubmitPINOptions): Promise<Object>;
+    submitOTP(options: SubmitOTPOptions): Promise<Object>;
+    submitPhone(options: SubmitPhoneOptions): Promise<Object>;
+    submitBirthday(options: SubmitBirthdayOptions): Promise<Object>;
+    checkCharge(options: CheckChargeOptions): Promise<Object>;
+  }
+
+  class BulkChargeResource {
+    get(options: GetBulkChargeOptions): Promise<Object>;
+    list(options: ListBulkChargesOptions): Promise<Object>;
+    pause(options: PauseBulkChargeOptions): Promise<Object>;
+    resume(options: ResumeBulkChargeOptions): Promise<Object>;
+    create(options: CreateBulkChargeOptions): Promise<Object>;
+    getCharges(options: GetChargesInBulkChargeOptions): Promise<Object>;
+  }
+
+  class InvoiceResource {
+    get(options: GetInvoiceOptions): Promise<Object>;
+    list(options: ListInvoicesOptions): Promise<Object>;
+    create(options: CreateInvoiceOptions): Promise<Object>;
+    verify(options: VerifyInvoiceOptions): Promise<Object>;
+    notify(options: SendInvoiceNotificationOptions): Promise<Object>;
+    invoiceMetrics(options: GetInvoiceTotalsOptions): Promise<Object>;
+    updateInvoice(options: UpdateInvoiceOptions): Promise<Object>;
+    archiveInvoice(options: ArchiveInvoiceOptions): Promise<Object>;
+    draftInvoice(options: FinalizeInvoiceOptions): Promise<Object>;
+  }
+}
diff --git a/types/interfaces.d.ts b/types/interfaces.d.ts
new file mode 100644
index 0000000..81b2b58
--- /dev/null
+++ b/types/interfaces.d.ts
@@ -0,0 +1,361 @@
+// types/interfaces.d.ts
+
+type Currency = "NGN" | "GHS" | "ZAR" | "USD";
+
+interface ListOptions {
+  page: Number;
+  perPage: Number;
+}
+
+interface DateFilterableListOptions extends ListOptions {
+  to: string;
+  from: string;
+}
+
+// Plan Resource
+
+interface GetPlanOptions {
+  id: string;
+}
+
+type PlanInterval = "daily" | "weekly" | "monthly" | "biannually" | "annually";
+
+interface ListPlansOptions extends ListOptions {
+  status: string;
+  amount: Number;
+  interval: PlanInterval;
+}
+
+interface CreatePlanOptions {
+  name: string;
+  amount: Number;
+  interval: PlanInterval;
+  description: string;
+  send_sms: boolean;
+  send_invoices: boolean;
+  currency: Currency;
+  invoice_limit: Number;
+}
+
+interface UpdatePlanOptions {
+  id: string;
+  name: string;
+  amount: Number;
+  interval: PlanInterval;
+  description: string;
+  send_sms: boolean;
+  send_invoices: boolean;
+  currency: Currency;
+  invoice_limit: Number;
+}
+
+// Customer Resource
+
+interface GetCustomerOptions {
+  // id can be email or customer code
+  id: string;
+}
+
+interface ListCustomersOptions extends DateFilterableListOptions {}
+
+interface CreateCustomerOptions {
+  email: string;
+  first_name: string;
+  last_name: string;
+  phone: string;
+  metadata: Object;
+}
+
+interface UpdateCustomerOptions {
+  first_name: string;
+  last_name: string;
+  phone: string;
+  metadata: Object;
+}
+
+type ValidateCustomerIdentification = "bvn" | "bank_account";
+
+interface ValidateCustomerOptions {
+  first_name: string;
+  last_name: string;
+  type: ValidateCustomerIdentification;
+  value: string;
+  country: string;
+  bvn: string;
+  bank_code: string;
+  account_number: string;
+}
+
+type CustomerRiskAction = "default" | "allow" | "deny";
+
+interface SetCustomerRiskActionOptions {
+  customer: string;
+  risk_action: CustomerRiskAction;
+}
+
+interface DeactivateCustomerAuthOptions {
+  authorization_code: string;
+}
+
+// Payment Page Resource
+
+interface GetPaymentPageOptions {
+  id: string;
+}
+
+interface ListPaymentPagesOptions extends DateFilterableListOptions {}
+
+interface CreatePaymentPageOptions {
+  name: string;
+  description: string;
+  amount: Number;
+  slug: string;
+  metadata: Object;
+  redirect_url: string;
+  custom_fields: [any];
+}
+
+interface UpdatePaymentPageOptions {
+  id: string;
+  name: string;
+  description: string;
+  amount: Number;
+  active: boolean;
+}
+
+interface CheckSlugAvailablilityOptions {
+  slug: string;
+}
+
+// Control Panel Resource
+
+interface UpdateSessionTimeoutOptions {
+  timeout: Number;
+}
+
+// Settlement Resource
+
+interface ListSettlementOptions extends DateFilterableListOptions {
+  id: string;
+}
+
+// Transfer Control Resource
+
+type ResendOTPReason = "resend_otp" | "transfer";
+
+interface ResendOTPOptions {
+  transfer_code: string;
+  reason: ResendOTPReason;
+}
+
+interface FinalizeDisableOTPOptions {
+  otp: string;
+}
+
+// Transfer Recipient
+
+interface ListTransferRecipientOptions extends DateFilterableListOptions {}
+
+interface CreateTransferRecipientOptions {
+  type: string;
+  name: string;
+  account_number: string;
+  bank_code: string;
+  description: string;
+  currency: string;
+  authorization_code: string;
+  metadata: Object;
+}
+
+interface UpdateTransferRecipientOptions {
+  id: string;
+  name: string;
+  email: string;
+}
+
+interface RemoveTransferRecipientOptions {
+  id: string;
+}
+
+// Refund Resource
+
+interface GetRefundOptions {
+  trans_id: string;
+}
+
+interface ListRefundsOptions extends DateFilterableListOptions {
+  reference: string;
+  currency: Currency;
+}
+
+interface CreateRefundOptions {
+  transaction: string;
+  amount: Number;
+  currency: Currency;
+  customer_note: string;
+  merchant_note: string;
+}
+
+// Subaccount Resource
+
+interface GetSubaccountOptions {
+  id: string;
+}
+
+interface ListSubaccountOptions extends DateFilterableListOptions {}
+
+interface CreateSubaccountOptions {
+  business_name: string;
+  settlement_bank: string;
+  account_number: string;
+  percentage_charge: Number;
+  description: string;
+}
+
+interface UpdateSubaccountOptions {
+  id: string;
+  business_name: string;
+  settlement_bank: string;
+  account_number: string;
+  percentage_charge: Number;
+  description: string;
+}
+
+// Charge Resource
+
+interface CreateChargeOptions {
+  email: string;
+  amount: Number;
+  bank: string;
+  authorization_code: string;
+  pin: string;
+  metadata: Object;
+  reference: string;
+  ussd: Object;
+  mobile_money: Object;
+  device_id: string;
+}
+
+interface SubmitPINOptions {
+  pin: string;
+  reference: string;
+}
+
+interface SubmitOTPOptions {
+  otp: string;
+  reference: string;
+}
+
+interface SubmitPhoneOptions {
+  phone: string;
+  reference: string;
+}
+interface SubmitBirthdayOptions {
+  birthday: string;
+  reference: string;
+}
+
+interface CheckChargeOptions {
+  reference: string;
+}
+
+// Bulk Charge Resource
+
+interface GetBulkChargeOptions {
+  id: string;
+}
+
+interface ListBulkChargesOptions extends DateFilterableListOptions {}
+
+interface PauseBulkChargeOptions {
+  batch_code: string;
+}
+
+interface ResumeBulkChargeOptions {
+  batch_code: string;
+}
+
+interface CreateBulkChargeOption {
+  amount: Number;
+  authorization: string;
+}
+
+interface CreateBulkChargeOptions extends Array<CreateBulkChargeOption> {}
+
+interface GetChargesInBulkChargeOptions extends DateFilterableListOptions {
+  id: string;
+  status: string;
+}
+
+// Invoice Resource
+
+interface GetInvoiceOptions {
+  invoice_id: string;
+}
+
+interface ListInvoicesOptions extends DateFilterableListOptions {
+  status: string;
+  customer: string;
+  currency: Currency;
+  include_archive: string;
+}
+
+interface Tax {
+  name: string;
+  amount: Number;
+}
+
+interface LineItem {
+  name: string;
+  amount: Number;
+  quantity: Number;
+}
+
+interface CreateInvoiceOptions {
+  customer: string;
+  amount: Number;
+  due_date: string;
+  description: string;
+  curreny: Currency;
+  tax: [Tax];
+  line_items: [LineItem];
+  send_notification: boolean;
+  draft: boolean;
+  has_invoice: boolean;
+  invoice_number: Number;
+  split_code: string;
+}
+
+interface VerifyInvoiceOptions {
+  invoice_code: string;
+}
+
+interface SendInvoiceNotificationOptions {
+  id: string;
+}
+
+interface GetInvoiceTotalsOptions {}
+
+interface UpdateInvoiceOptions {
+  id: string;
+  customer: string;
+  amount: Number;
+  due_date: string;
+  description: string;
+  curreny: Currency;
+  tax: [Tax];
+  line_items: [LineItem];
+  send_notification: boolean;
+  draft: boolean;
+  has_invoice: boolean;
+  invoice_number: Number;
+  split_code: string;
+}
+
+interface ArchiveInvoiceOptions {
+  id: string;
+}
+
+interface FinalizeInvoiceOptions {
+  id: string;
+}