diff --git a/.changeset/forty-moons-wash.md b/.changeset/forty-moons-wash.md
new file mode 100644
index 0000000000000..0c943d4fdad53
--- /dev/null
+++ b/.changeset/forty-moons-wash.md
@@ -0,0 +1,5 @@
+---
+"@medusajs/types": patch
+---
+
+feat: Payment Module service interface
diff --git a/packages/types/src/payment/common.ts b/packages/types/src/payment/common.ts
new file mode 100644
index 0000000000000..01788395ed35b
--- /dev/null
+++ b/packages/types/src/payment/common.ts
@@ -0,0 +1,30 @@
+import { BaseFilterable } from "../dal"
+import { OperatorMap } from "../dal/utils"
+
+/* ********** PAYMENT COLLECTION ********** */
+
+export interface PaymentCollectionDTO {
+  /**
+   * The ID of the Payment Collection
+   */
+  id: string
+}
+
+export interface FilterablePaymentCollectionProps
+  extends BaseFilterable<PaymentCollectionDTO> {
+  id?: string | string[]
+
+  region_id?: string | string[] | OperatorMap<string>
+
+  created_at?: OperatorMap<string>
+  updated_at?: OperatorMap<string>
+}
+
+/* ********** PAYMENT ********** */
+
+export interface PaymentDTO {
+  /**
+   * The ID of the Payment Collection
+   */
+  id: string
+}
diff --git a/packages/types/src/payment/index.ts b/packages/types/src/payment/index.ts
index 9376fea807351..a83c8a61ef6d7 100644
--- a/packages/types/src/payment/index.ts
+++ b/packages/types/src/payment/index.ts
@@ -1 +1,4 @@
+export * from "./common"
+export * from "./mutations"
 export * from "./service"
+
diff --git a/packages/types/src/payment/mutations.ts b/packages/types/src/payment/mutations.ts
new file mode 100644
index 0000000000000..35f72d81dfa9d
--- /dev/null
+++ b/packages/types/src/payment/mutations.ts
@@ -0,0 +1,47 @@
+/**
+ * TODO
+ */
+
+export interface CreatePaymentCollectionDTO {
+  region_id: string
+  currency_code: string
+  amount: number
+}
+
+export interface UpdatePaymentCollectionDTO
+  extends Partial<CreatePaymentCollectionDTO> {}
+
+export interface CreatePaymentDTO {
+  amount: number
+  currency_code: string
+  provider_id: string
+  data: Record<string, unknown>
+
+  cart_id?: string
+  order_id?: string
+  order_edit_id?: string
+  customer_id?: string
+}
+
+export interface UpdatePaymentDTO {
+  cart_id?: string
+  order_id?: string
+  order_edit_id?: string
+  customer_id?: string
+}
+
+export interface CreatePaymentSessionDTO {
+  amount: number
+  currency_code: string
+  provider_id: string
+
+  cart_id?: string
+  resource_id?: string
+  customer_id?: string
+}
+
+export interface SetPaymentSessionsDTO {
+  provider_id: string
+  amount: number
+  session_id?: string
+}
diff --git a/packages/types/src/payment/service.ts b/packages/types/src/payment/service.ts
index 80c70e30da2e7..94951f55455c0 100644
--- a/packages/types/src/payment/service.ts
+++ b/packages/types/src/payment/service.ts
@@ -1,3 +1,131 @@
 import { IModuleService } from "../modules-sdk"
+import { Context } from "../shared-context"
+import {
+  CreatePaymentCollectionDTO,
+  CreatePaymentDTO,
+  CreatePaymentSessionDTO,
+  SetPaymentSessionsDTO,
+  UpdatePaymentCollectionDTO,
+  UpdatePaymentDTO,
+} from "./mutations"
+import {
+  FilterablePaymentCollectionProps,
+  PaymentCollectionDTO,
+  PaymentDTO,
+} from "./common"
+import { FindConfig } from "../common"
 
-export interface IPaymentModuleService extends IModuleService {}
+export interface IPaymentModuleService extends IModuleService {
+  /* ********** PAYMENT COLLECTION ********** */
+
+  createPaymentCollection(
+    data: CreatePaymentCollectionDTO[],
+    sharedContext?: Context
+  ): Promise<PaymentCollectionDTO[]>
+  createPaymentCollection(
+    data: CreatePaymentCollectionDTO,
+    sharedContext?: Context
+  ): Promise<PaymentCollectionDTO>
+
+  retrievePaymentCollection(
+    paymentCollectionId: string,
+    config?: FindConfig<PaymentCollectionDTO>,
+    sharedContext?: Context
+  ): Promise<PaymentCollectionDTO>
+
+  listPaymentCollections(
+    filters?: FilterablePaymentCollectionProps,
+    config?: FindConfig<PaymentCollectionDTO>,
+    sharedContext?: Context
+  ): Promise<PaymentCollectionDTO[]>
+
+  listAndCountPaymentCollections(
+    filters?: FilterablePaymentCollectionProps,
+    config?: FindConfig<PaymentCollectionDTO>,
+    sharedContext?: Context
+  ): Promise<[PaymentCollectionDTO[], number]>
+
+  updatePaymentCollection(
+    data: UpdatePaymentCollectionDTO[],
+    sharedContext?: Context
+  ): Promise<PaymentCollectionDTO[]>
+  updatePaymentCollection(
+    data: UpdatePaymentCollectionDTO,
+    sharedContext?: Context
+  ): Promise<PaymentCollectionDTO>
+
+  deletePaymentCollection(
+    paymentCollectionId: string[],
+    sharedContext?: Context
+  ): Promise<void>
+  deletePaymentCollection(
+    paymentCollectionId: string,
+    sharedContext?: Context
+  ): Promise<void>
+
+  authorizePaymentCollection(
+    paymentCollectionId: string,
+    sharedContext?: Context
+  ): Promise<PaymentCollectionDTO>
+
+  completePaymentCollection(
+    paymentCollectionId: string,
+    sharedContext?: Context
+  ): Promise<PaymentCollectionDTO>
+
+  /* ********** PAYMENT ********** */
+
+  createPayment(data: CreatePaymentDTO): Promise<PaymentDTO>
+  createPayment(data: CreatePaymentDTO[]): Promise<PaymentDTO[]>
+
+  capturePayment(
+    paymentId: string,
+    amount: number,
+    sharedContext?: Context
+  ): Promise<PaymentDTO>
+  refundPayment(
+    paymentId: string,
+    amount: number,
+    sharedContext?: Context
+  ): Promise<PaymentDTO>
+
+  updatePayment(
+    data: UpdatePaymentDTO,
+    sharedContext?: Context
+  ): Promise<PaymentDTO>
+  updatePayment(
+    data: UpdatePaymentDTO[],
+    sharedContext?: Context
+  ): Promise<PaymentDTO[]>
+
+  /* ********** PAYMENT SESSION ********** */
+
+  createPaymentSession(
+    paymentCollectionId: string,
+    data: CreatePaymentSessionDTO,
+    sharedContext?: Context
+  ): Promise<PaymentCollectionDTO>
+  createPaymentSession(
+    paymentCollectionId: string,
+    data: CreatePaymentSessionDTO[],
+    sharedContext?: Context
+  ): Promise<PaymentCollectionDTO>
+
+  authorizePaymentSessions(
+    paymentCollectionId: string,
+    sessionIds: string[],
+    sharedContext?: Context
+  ): Promise<PaymentCollectionDTO>
+
+  completePaymentSessions(
+    paymentCollectionId: string,
+    sessionIds: string[],
+    sharedContext?: Context
+  ): Promise<PaymentCollectionDTO>
+
+  setPaymentSessions(
+    paymentCollectionId: string,
+    data: SetPaymentSessionsDTO[],
+    sharedContext?: Context
+  ): Promise<PaymentCollectionDTO>
+}