> ## Documentation Index > Fetch the complete documentation index at: https://docs.commercepay.asia/llms.txt > Use this file to discover all available pages before exploring further. # Query Payment > Payment gateway checks the existing payment status. The following input parameters are expected to be provided by the merchant to verify transaction status or to obtain more details on the payment before approving the customer’s order. ## OpenAPI ````yaml /openapi.json get /api/services/app/PaymentGateway/Query openapi: 3.0.1 info: title: CommercePay API version: v1 description: > --- **Credentials Accounts** Every account is provided with separate keys for testing and for running live transactions. Once the merchant application has been approved, developers can begin the process of integrating the CommercePay API. The following details will be provided to get started with the integration. Get Started contact: {} servers: - description: Staging url: https://staging-payments.commerce.asia - url: https://payments.commerce.asia description: Production security: [] paths: /api/services/app/PaymentGateway/Query: get: tags: - PaymentGateway summary: Query Payment description: >- Payment gateway checks the existing payment status. The following input parameters are expected to be provided by the merchant to verify transaction status or to obtain more details on the payment before approving the customer’s order. operationId: ApiServicesAppPaymentgatewayQueryGet parameters: - name: TransactionNumber in: query schema: type: string maxLength: 24 description: >- Unique CAP Transaction Number **(Conditional: If it is query for specific transaction in either normal transaction or session transaction, then need pass the transaction number)** - name: Timestamp in: query schema: type: integer format: int64 example: 1621851652617 description: new Date().getTime() - $ref: '#/components/parameters/AbpTenantId' - $ref: '#/components/parameters/Authorization' - $ref: '#/components/parameters/CapSignature' - schema: type: string maxLength: 24 in: query name: SessionNumber description: >- Unique CAP Session Number **(Conditional: If the query is query the session, then need pass the session number)** responses: '200': description: Success content: application/json: schema: $ref: '#/components/schemas/QueryPaymentOutputDto' examples: Example Response: value: transactionNumber: string paymentSessionNumber: string referenceCode: string status: 0 currencyCode: MYR amount: 1000 channelId: 1 providerTransactionNumber: string creationTime: '2022-02-10T08:50:30.565Z' remark: string providerChannelId: string providerPaymentMethod: string providerErrorMessage: string loyaltyType: 1 redemptionPoint: 100 redemptionAmount: 100 rewardPoint: 100 paidAmount: 900 loyaltyRedemptionStatus: 0 loyaltyRewardStatus: 0 text/json: schema: $ref: '#/components/schemas/QueryPaymentOutputDto' components: parameters: AbpTenantId: schema: type: string in: header name: Abp-TenantId required: true description: Your unique Merchant ID assigned by CommercePay. Authorization: schema: type: string in: header name: Authorization required: true description: Your API credentials used for authentication (typically a Bearer token). CapSignature: schema: type: string in: header name: cap-signature required: true description: >- A unique security hash used to verify the integrity of the request body. See [Generate Signature](/docs/generate-signature) for how to generate this. schemas: QueryPaymentOutputDto: type: object additionalProperties: false x-examples: {} properties: transactionNumber: type: string description: Unique CAP transaction number maxLength: 24 nullable: true paymentSessionNumber: type: string description: Unique CAP session number maxLength: 24 nullable: true referenceCode: type: string description: Merchant Reference Code maxLength: 50 nullable: true status: $ref: '#/components/schemas/PaymentStatus' currencyCode: type: string description: Currency code with a 3-letter ISO 4217 standard code example: MYR maxLength: 3 nullable: true amount: type: integer format: int64 description: | This is Request Amount. example: 100 channelId: type: integer format: int32 description: >- Refer to endpoints in [Get Channel List](/api-reference/get-tenant-channels-by-country) providerTransactionNumber: type: string description: Provider Transaction Number nullable: true creationTime: type: string format: date-time description: Payment Transaction Creation Time example: '2022-02-10T08:50:30.565Z' remark: type: string description: >- A description that additional information or clarify details for the transaction. nullable: true providerChannelId: type: string description: An identifier that represents the payment provider channel nullable: true providerPaymentMethod: type: string description: Provider Payment Method nullable: true providerErrorMessage: type: string description: Provider Error Message nullable: true loyaltyType: $ref: '#/components/schemas/LoyaltyProviderType' redemptionPoint: type: integer format: int64 description: '**[Conditional for Loyalty Payment]** Redemption Point.' redemptionAmount: type: integer format: int64 description: '**[Conditional for Loyalty Payment]** Redemption Amount.' rewardPoint: type: integer format: int64 description: '**[Conditional for Loyalty Payment]** Reward Point.' paidAmount: type: integer format: int64 description: "**[Conditional for Loyalty Payment]** This is Paid Amount.\r\n" example: 100 loyaltyRedemptionStatus: $ref: '#/components/schemas/LoyaltyRedemptionStatus' loyaltyRewardStatus: $ref: '#/components/schemas/LoyaltyRewardStatus' PaymentStatus: enum: - 0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 type: integer format: int32 x-enumNames: - Pending - Success - Failed - Cancelled - TransactionLimitExceeded - MinTransactionAmountNotMeet - InsufficientFunds - InvalidTransaction description: 'Payment Status: Refer on Appendix 3.1 Payment Status Code Table' LoyaltyProviderType: title: LoyaltyProviderType enum: - 1 description: |- **[Conditional for Loyalty Payment]** 1 = BCard LoyaltyRedemptionStatus: title: LoyaltyRedemptionStatus enum: - 0 - 1 - 2 - 3 description: |- **[Conditional for Loyalty Payment]** 0 = Pending, 1 = Success, 2 = Failed, 3 = Void LoyaltyRewardStatus: title: LoyaltyRewardStatus enum: - 0 - 1 - 2 - 3 description: |- **[Conditional for Loyalty Payment]** 0 = Pending, 1 = Success, 2 = Failed, 3 = Void ````