diff --git a/src/sections/merchant-fulfillment.ts b/src/sections/merchant-fulfillment.ts
index 099b3fcb..9f1a73e5 100644
--- a/src/sections/merchant-fulfillment.ts
+++ b/src/sections/merchant-fulfillment.ts
@@ -1,11 +1,245 @@
+import { record, string, unknown } from 'purify-ts'
+
+import { ParsingError } from '../error'
 import { HttpClient, Resource } from '../http'
 import { getServiceStatusByResource } from './shared'
 
 const MERCHANT_FULFILLMENT_API_VERSION = '2015-06-01'
 
+export interface Weight {
+  Value: number
+  Unit: 'ounces' | 'grams'
+  [key: string]: string | number
+}
+
+export type SellerInputDataType =
+  | 'String'
+  | 'Boolean'
+  | 'Integer'
+  | 'Timestamp'
+  | 'Address'
+  | 'Weight'
+  | 'Dimension'
+  | 'Currency'
+
+export interface Address {
+  Name: string
+  AddressLine1: string
+  AddressLine2?: string
+  AddressLine3?: string
+  DistrictOrCounty?: string
+  Email: string
+  City: string
+  StateOrProvinceCode?: string
+  PostalCode: string
+  CountryCode: string
+  Phone: string
+  [key: string]: string | undefined
+}
+
+export type PredefinedPackageDimensions =
+  | 'FedEx_Box_10kg'
+  | 'FedEx_Box_25kg'
+  | 'FedEx_Box_Extra_Large_1'
+  | 'FedEx_Box_Extra_Large_2'
+  | 'FedEx_Box_Large_1'
+  | 'FedEx_Box_Large_2'
+  | 'FedEx_Box_Medium_1'
+  | 'FedEx_Box_Medium_2'
+  | 'FedEx_Box_Small_1'
+  | 'FedEx_Box_Small_2'
+  | 'FedEx_Envelope'
+  | 'FedEx_Padded_Pak'
+  | 'FedEx_Pak_1'
+  | 'FedEx_Pak_2'
+  | 'FedEx_Tube'
+  | 'FedEx_XL_Pak'
+  | 'UPS_Box_10kg'
+  | 'UPS_Box_25kg'
+  | 'UPS_Express_Box'
+  | 'UPS_Express_Box_Large'
+  | 'UPS_Express_Box_Medium'
+  | 'UPS_Express_Box_Small'
+  | 'UPS_Express_Envelope'
+  | 'UPS_Express_Hard_Pak'
+  | 'UPS_Express_Legal_Envelope'
+  | 'UPS_Express_Pak'
+  | 'UPS_Express_Tube'
+  | 'UPS_Laboratory_Pak'
+  | 'UPS_Pad_Pak'
+  | 'UPS_Pallet'
+  | 'USPS_Card'
+  | 'USPS_Flat'
+  | 'USPS_FlatRateCardboardEnvelope'
+  | 'USPS_FlatRateEnvelope'
+  | 'USPS_FlatRateGiftCardEnvelope'
+  | 'USPS_FlatRateLegalEnvelope'
+  | 'USPS_FlatRatePaddedEnvelope'
+  | 'USPS_FlatRateWindowEnvelope'
+  | 'USPS_LargeFlatRateBoardGameBox'
+  | 'USPS_LargeFlatRateBox'
+  | 'USPS_Letter'
+  | 'USPS_MediumFlatRateBox1'
+  | 'USPS_MediumFlatRateBox2'
+  | 'USPS_RegionalRateBoxA1'
+  | 'USPS_RegionalRateBoxA2'
+  | 'USPS_RegionalRateBoxB1'
+  | 'USPS_RegionalRateBoxB2'
+  | 'USPS_RegionalRateBoxC'
+  | 'USPS_SmallFlatRateBox'
+  | 'USPS_SmallFlatRateEnvelope'
+
+export interface PackageDimensions {
+  Length?: number
+  Width?: number
+  Height?: number
+  Unit?: 'inches' | 'centimeters'
+  PredefinedPackageDimensions?: PredefinedPackageDimensions
+  [key: string]: string | number | undefined
+}
+
+export interface CurrencyAmount {
+  CurrencyCode: string
+  Amount: number
+  [key: string]: string | number
+}
+export interface AdditionalSellerInput {
+  DataType: SellerInputDataType
+  ValueAsString?: string
+  ValueAsBoolean?: boolean
+  ValueAsInteger?: number
+  // @todo
+  // ValueAsTimestamp?: Date // this needs an issue. "parameters should be able to handle Date objects"
+  ValueAsTimestamp?: string
+  ValueAsAddress?: Address
+  ValueAsWeight?: Weight
+  ValueAsDimension?: PackageDimensions
+  ValueAsCurrency?: CurrencyAmount
+}
+
+interface AdditionalSellerInputs {
+  AdditionalInputFieldName: string
+  AdditionalSellerInput: AdditionalSellerInput
+}
+
+/**
+ * Needs clarification
+ * @todo
+ * http://docs.developer.amazonservices.com/en_CA/merch_fulfill/MerchFulfill_Datatypes.html#ItemLevelSellerInputs
+ */
+export interface ItemLevelSellerInputsList {
+  AdditionalSellerInputs: AdditionalSellerInputs[]
+}
+
+export interface Item {
+  OrderItemId: string
+  Quantity: number
+  ItemWeight?: Weight
+  ItemDescription?: string
+  TransparencyCodeList?: string[]
+  // ItemLevelSellerInputsList?: ItemLevelSellerInputsList // Need to do more research on this
+}
+
+export type DeliveryExperience =
+  | 'DeliveryConfirmationWithAdultSignature'
+  | 'DeliveryConfirmationWithSignature'
+  | 'DeliveryConfirmationWithoutSignature'
+  | 'NoTracking'
+
+export interface ShippingServiceOptions {
+  DeliveryExperience: DeliveryExperience
+  DeclaredValue?: CurrencyAmount
+  CarrierWillPickup: boolean
+  LabelFormat?: string
+  [key: string]: string | boolean | undefined | DeliveryExperience | CurrencyAmount
+}
+
+export interface LabelCustomization {
+  CustomTextForLabel?: string
+  StandardIdForLabel?: string
+  [key: string]: string | undefined
+}
+export interface ShipmentRequestDetails {
+  AmazonOrderId: string
+  SellerOrderId?: string
+  ItemList: Item[]
+  ShipFromAddress: Address
+  PackageDimensions: PackageDimensions
+  Weight: Weight
+  MustArriveByDate?: Date
+  ShipDate?: Date
+  ShippingServiceOptions: ShippingServiceOptions
+  LabelCustomization?: LabelCustomization
+}
+
+export interface ShippingOfferingFilter {
+  IncludeComplexShippingOptions?: boolean
+}
+export interface GetEligibleShippingServicesParameters {
+  ShipmentRequestDetails: ShipmentRequestDetails
+  ShippingOfferingFilter?: ShippingOfferingFilter
+}
+
+const canonicalizeParametersGetEligibleShippingServiceParameters = (
+  parameters: GetEligibleShippingServicesParameters,
+) => {
+  const { ShipmentRequestDetails, ShippingOfferingFilter } = parameters
+  const {
+    AmazonOrderId,
+    SellerOrderId,
+    ShipFromAddress,
+    PackageDimensions,
+    Weight,
+    MustArriveByDate,
+    ShipDate,
+    ShippingServiceOptions,
+    LabelCustomization,
+  } = ShipmentRequestDetails
+  const ItemsList = ShipmentRequestDetails?.ItemList.map((item) => ({
+    ...item,
+    TransparencyCodeList: undefined,
+    'TransparemcyCodeList.TransparencyCode': item.TransparencyCodeList,
+  }))
+  return {
+    ShippingOfferingFilter: {
+      IncludeComplexShippingOptions: ShippingOfferingFilter?.IncludeComplexShippingOptions,
+    },
+    ShipmentRequestDetails: {
+      AmazonOrderId,
+      SellerOrderId,
+      'ItemList.Item': ItemsList,
+      ShipFromAddress,
+      PackageDimensions,
+      Weight,
+      MustArriveByDate: MustArriveByDate?.toISOString(),
+      ShipDate: ShipDate?.toISOString(),
+      ShippingServiceOptions,
+      LabelCustomization,
+    },
+  }
+}
+
+const GetEligibleShippingServicesResponse = record(string, unknown)
+
 export class MerchantFulfillment {
   constructor(private httpClient: HttpClient) {}
 
+  async getEligibleShippingServices(parameters: GetEligibleShippingServicesParameters) {
+    const [response, meta] = await this.httpClient.request('POST', {
+      resource: Resource.MerchantFulfillment,
+      version: MERCHANT_FULFILLMENT_API_VERSION,
+      action: 'GetEligibleShippingServices',
+      parameters: canonicalizeParametersGetEligibleShippingServiceParameters(parameters),
+    })
+
+    return GetEligibleShippingServicesResponse.decode(response).caseOf({
+      Right: (x) => [x.GetEligibleShippingServicesResponse.GetEligibleShippingServicesResult, meta],
+      Left: (error) => {
+        throw new ParsingError(error)
+      },
+    })
+  }
+
   async getServiceStatus() {
     return getServiceStatusByResource(
       this.httpClient,