diff --git a/vehicles/src/common/helper/validate-loa.helper.ts b/vehicles/src/common/helper/validate-loa.helper.ts
new file mode 100644
index 000000000..f881e88bc
--- /dev/null
+++ b/vehicles/src/common/helper/validate-loa.helper.ts
@@ -0,0 +1,42 @@
+import { ReadLoaDto } from 'src/modules/special-auth/dto/response/read-loa.dto';
+import { PermitType } from '../enum/permit-type.enum';
+import { Loas } from '../interface/permit.template.interface';
+import { Permit } from 'src/modules/permit-application-payment/permit/entities/permit.entity';
+import * as dayjs from 'dayjs';
+
+export const isVehicleTypeValid = (
+  permitVehicleType: string,
+  permitVehicleId: string,
+  powerUnits?: string[],
+  trailers?: string[],
+): boolean => {
+  const isPowerUnitAllowed =
+    permitVehicleType === 'powerUnit'
+      ? powerUnits.includes(permitVehicleId)
+      : true;
+
+  const isTrailerAllowed =
+    permitVehicleType === 'trailer' ? trailers.includes(permitVehicleId) : true;
+
+  return isPowerUnitAllowed && isTrailerAllowed;
+};
+
+export const isPermitTypeValid = (
+  permitTypePermit: PermitType,
+  permitType: PermitType[],
+): boolean => {
+  return permitType.includes(permitTypePermit);
+};
+
+export const isValidDateForLoa = (
+  loaDetail: Loas | ReadLoaDto,
+  permit: Permit,
+): boolean => {
+  const { startDate, expiryDate } = loaDetail;
+  const { startDate: permitStartDate, expiryDate: permitExpiryDate } =
+    permit.permitData;
+  return (
+    dayjs(startDate).isBefore(permitStartDate, 'day') &&
+    (expiryDate ? dayjs(expiryDate).isAfter(permitExpiryDate, 'day') : true)
+  );
+};
diff --git a/vehicles/src/common/interface/permit.template.interface.ts b/vehicles/src/common/interface/permit.template.interface.ts
index 1e66955ab..056625b04 100644
--- a/vehicles/src/common/interface/permit.template.interface.ts
+++ b/vehicles/src/common/interface/permit.template.interface.ts
@@ -1,3 +1,4 @@
+import { PermitType } from '../enum/permit-type.enum';
 import { ThirdPartyLiability } from '../enum/third-party-liability.enum';
 
 // Data used to populate a .docx template
@@ -92,6 +93,7 @@ interface ContactDetails {
 }
 
 interface VehicleDetails {
+  vehicleId: string;
   vin: string;
   plate: string;
   make: string;
@@ -112,8 +114,14 @@ interface Commodities {
   disabled?: boolean;
 }
 
-interface Loas {
-  loaId: string;
+export interface Loas {
+  loaId: number;
+  loaNumber: number;
   checked: boolean;
+  loaPermitType: PermitType[];
+  startDate: string;
+  expiryDate?: string;
+  powerUnits?: string[];
+  trailers?: string[];
   disabled?: boolean;
 }
diff --git a/vehicles/src/modules/permit-application-payment/payment/payment.module.ts b/vehicles/src/modules/permit-application-payment/payment/payment.module.ts
index 3f608c805..ce08d7fb3 100644
--- a/vehicles/src/modules/permit-application-payment/payment/payment.module.ts
+++ b/vehicles/src/modules/permit-application-payment/payment/payment.module.ts
@@ -11,6 +11,7 @@ import { PaymentMethodType } from './entities/payment-method-type.entity';
 import { PaymentReportService } from './payment-report.service';
 import { Permit } from '../permit/entities/permit.entity';
 import { CfsTransactionDetail } from './entities/cfs-transaction.entity';
+import { LoaDetail } from 'src/modules/special-auth/entities/loa-detail.entity';
 
 @Module({
   imports: [
@@ -22,6 +23,7 @@ import { CfsTransactionDetail } from './entities/cfs-transaction.entity';
       PaymentCardType,
       PaymentMethodType,
       CfsTransactionDetail,
+      LoaDetail,
     ]),
   ],
   controllers: [PaymentController],
diff --git a/vehicles/src/modules/permit-application-payment/payment/payment.service.ts b/vehicles/src/modules/permit-application-payment/payment/payment.service.ts
index e511f1ced..7b0f1e115 100644
--- a/vehicles/src/modules/permit-application-payment/payment/payment.service.ts
+++ b/vehicles/src/modules/permit-application-payment/payment/payment.service.ts
@@ -73,6 +73,14 @@ import {
 } from '../../../common/helper/common.helper';
 import { SpecialAuth } from 'src/modules/special-auth/entities/special-auth.entity';
 import { TIMEZONE_PACIFIC } from 'src/common/constants/api.constant';
+import { PermitData } from 'src/common/interface/permit.template.interface';
+import { LoaDetail } from 'src/modules/special-auth/entities/loa-detail.entity';
+import {
+  isPermitTypeValid,
+  isValidDateForLoa,
+  isVehicleTypeValid,
+} from 'src/common/helper/validate-loa.helper';
+import { ReadLoaDto } from 'src/modules/special-auth/dto/response/read-loa.dto';
 
 @Injectable()
 export class PaymentService {
@@ -87,6 +95,8 @@ export class PaymentService {
     private paymentMethodTypeRepository: Repository<PaymentMethodType>,
     @InjectRepository(PaymentCardType)
     private paymentCardTypeRepository: Repository<PaymentCardType>,
+    @InjectRepository(LoaDetail)
+    private loaDetailRepository: Repository<LoaDetail>,
     @InjectMapper() private readonly classMapper: Mapper,
     @Inject(CACHE_MANAGER)
     private readonly cacheManager: Cache,
@@ -331,6 +341,13 @@ export class PaymentService {
           throw new BadRequestException(
             'Application in its current status cannot be processed for payment.',
           );
+        const permitData = JSON.parse(
+          application.permitData.permitData,
+        ) as PermitData;
+        // If application includes LoAs then validate Loa data.
+        if (permitData.loas) {
+          await this.isValidLoa(application);
+        }
       }
       const totalTransactionAmount = await this.validateApplicationAndPayment(
         createTransactionDto,
@@ -887,4 +904,137 @@ export class PaymentService {
       })),
     ) as PermitHistoryDto[];
   }
+
+  async isValidLoa(permit: Permit): Promise<void> {
+    const { companyId } = permit.company;
+    const permitData = JSON.parse(permit.permitData.permitData) as PermitData;
+    const { vehicleId: permitVehicleId, vehicleType: permitVehicleType } =
+      permitData.vehicleDetails;
+    const loaNumbers = permitData.loas.map((loa) => loa.loaNumber);
+    const readLoaDto = await this.findLoas(companyId, loaNumbers);
+
+    // Validate LOA details and permit data against database entries
+    this.validateLoaDetails(
+      readLoaDto,
+      permit,
+      permitVehicleId,
+      permitVehicleType,
+    );
+
+    // validate LoA snapshot in permit Data
+    this.validatePermitDataAgainstLoas(
+      permitData,
+      permit,
+      permitVehicleId,
+      permitVehicleType,
+    );
+  }
+  private validateLoaDetails(
+    readLoaDtos: ReadLoaDto[],
+    permit: Permit,
+    permitVehicleId: string,
+    permitVehicleType: string,
+  ) {
+    for (const readLoaDto of readLoaDtos) {
+      const loaPowerUnits = readLoaDto.powerUnits;
+      const loaTrailers = readLoaDto.trailers;
+      const loaPermitTypes = readLoaDto.loaPermitType;
+      if (!isValidDateForLoa(readLoaDto, permit)) {
+        throw new UnprocessableEntityException(
+          `${permit.applicationNumber} has LoA with invalid date(s).`,
+        );
+      }
+      if (
+        !isVehicleTypeValid(
+          permitVehicleType,
+          permitVehicleId,
+          loaPowerUnits,
+          loaTrailers,
+        )
+      ) {
+        throw new UnprocessableEntityException(
+          `${permit.applicationNumber} has LoA with invalid vehicle(s).`,
+        );
+      }
+      if (!isPermitTypeValid(permit.permitType, loaPermitTypes)) {
+        throw new UnprocessableEntityException(
+          `${permit.applicationNumber} ha LoA with invalid permitType.`,
+        );
+      }
+    }
+  }
+
+  private validatePermitDataAgainstLoas(
+    permitData: PermitData,
+    permit: Permit,
+    permitVehicleId: string,
+    permitVehicleType: string,
+  ) {
+    for (const loa of permitData.loas) {
+      const permitLoaPowerUnits = loa.powerUnits;
+      const permitLoaTrailers = loa.trailers;
+      const permitTypesLoa = loa.loaPermitType;
+      if (!isValidDateForLoa(loa, permit)) {
+        throw new UnprocessableEntityException(
+          `${permit.applicationNumber} has LoA snapshot with invalid date(s).`,
+        );
+      }
+
+      if (
+        !isVehicleTypeValid(
+          permitVehicleType,
+          permitVehicleId,
+          permitLoaPowerUnits,
+          permitLoaTrailers,
+        )
+      ) {
+        throw new UnprocessableEntityException(
+          `${permit.applicationNumber} has LoA snapshot with invalid vehicle(s).`,
+        );
+      }
+      if (!isPermitTypeValid(permit.permitType, permitTypesLoa)) {
+        throw new UnprocessableEntityException(
+          `${permit.applicationNumber} has LoA snapshot with invalid permitType.`,
+        );
+      }
+    }
+  }
+
+  /**
+   * Retrieves a single LOA (Letter of Authorization) detail for a specified company.
+   *
+   * Steps:
+   * 1. Fetches the LOA detail from the repository based on company ID and LOA Number.
+   * 2. Ensures the fetched LOA detail is active.
+   * 3. Includes relations (company, loaVehicles, loaPermitTypes) in the query.
+   *
+   * @param {number} companyId - ID of the company for which to fetch the LOA detail.
+   * @param {number} loaId - ID of the LOA to be fetched.
+   * @returns {Promise<LoaDetail>} - Returns a Promise that resolves to the LOA detail.
+   */
+  @LogAsyncMethodExecution()
+  async findLoas(
+    companyId: number,
+    loaNumbers: number[],
+  ): Promise<ReadLoaDto[]> {
+    // Fetch initial active LOA details
+    const loaDetails = await this.loaDetailRepository.find({
+      where: {
+        loaNumber: In(loaNumbers),
+        isActive: true,
+        company: { companyId },
+      },
+      relations: ['company', 'loaVehicles', 'loaPermitTypes'],
+    });
+
+    const readLoaDto = await this.classMapper.mapArrayAsync(
+      loaDetails,
+      LoaDetail,
+      ReadLoaDto,
+      {
+        extraArgs: () => ({ companyId: companyId }),
+      },
+    );
+    return readLoaDto;
+  }
 }