> ## Documentation Index > Fetch the complete documentation index at: https://ramps-docs-sync-20260321.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Simulate payment send to test receiving an UMA payment > Simulate sending payment from an sandbox uma address to a platform customer to test payment receive. This endpoint is only for the sandbox environment and will fail for production platforms/keys. ## OpenAPI ````yaml https://app.stainless.com/api/spec/documented/grid/openapi.documented.yml post /sandbox/uma/receive openapi: 3.1.0 info: title: Grid API description: > API for managing global payments on the open Money Grid. Built by Lightspark. See the full documentation at https://grid.lightspark.com/. version: '2025-10-13' contact: name: Lightspark Support email: support@lightspark.com license: name: Proprietary url: https://lightspark.com/terms servers: - url: https://api.lightspark.com/grid/2025-10-13 description: Production server security: - BasicAuth: [] tags: - name: Platform Configuration description: >- Platform configuration endpoints for managing global settings. You can also configure these settings in the Grid dashboard. - name: Customers description: >- Customer management endpoints for creating and updating customer information - name: KYC/KYB Verifications description: >- Endpoints for Know Your Customer (KYC) and Know Your Business (KYB) verification, including managing beneficial owners and triggering verification for customers. - name: Documents description: >- Endpoints for uploading and managing verification documents for customers and beneficial owners. Supports KYC and KYB document requirements. - name: Internal Accounts description: >- Internal account management endpoints for creating and managing internal accounts - name: External Accounts description: >- External account management endpoints for creating and managing external bank accounts - name: Same-Currency Transfers description: >- Endpoints for transferring funds between internal and external accounts with the same currency - name: Cross-Currency Transfers description: Endpoints for creating and confirming quotes for cross-currency transfers - name: Transactions description: Endpoints for retrieving transaction information - name: Webhooks description: Webhook endpoints and configuration for receiving notifications - name: Invitations description: Endpoints for creating, claiming and managing UMA invitations - name: Sandbox description: Endpoints to trigger test cases in sandbox - name: API Tokens description: Endpoints to programmatically manage API tokens - name: Exchange Rates description: >- Endpoints for retrieving cached foreign exchange rates. Rates are cached for approximately 5 minutes and include platform-specific fees. - name: Discoveries description: >- Endpoints for discovering available payment rails, banks, and providers for a given country and currency corridor. paths: /sandbox/uma/receive: post: tags: - Sandbox summary: Simulate payment send to test receiving an UMA payment description: > Simulate sending payment from an sandbox uma address to a platform customer to test payment receive. This endpoint is only for the sandbox environment and will fail for production platforms/keys. operationId: sandboxReceive requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/SandboxUmaReceiveRequest' responses: '200': description: Payment triggered successfully content: application/json: schema: $ref: '#/components/schemas/IncomingTransaction' '400': description: Bad request content: application/json: schema: $ref: '#/components/schemas/Error400' '401': description: Unauthorized content: application/json: schema: $ref: '#/components/schemas/Error401' '403': description: Forbidden - request was made with a production platform token content: application/json: schema: $ref: '#/components/schemas/Error403' '404': description: Sender or receiver not found content: application/json: schema: $ref: '#/components/schemas/Error404' '500': description: Internal service error content: application/json: schema: $ref: '#/components/schemas/Error500' security: - BasicAuth: [] x-codeSamples: - lang: JavaScript source: >- import LightsparkGrid from '@lightsparkdev/grid'; const client = new LightsparkGrid({ username: process.env['GRID_CLIENT_ID'], // This is the default and can be omitted password: process.env['GRID_CLIENT_SECRET'], // This is the default and can be omitted }); const incomingTransaction = await client.sandbox.uma.receivePayment({ receivingCurrencyAmount: 1000, receivingCurrencyCode: 'USD', senderUmaAddress: '$success.usd@sandbox.grid.uma.money', }); console.log(incomingTransaction.id); - lang: Python source: |- import os from grid import LightsparkGrid client = LightsparkGrid( username=os.environ.get("GRID_CLIENT_ID"), # This is the default and can be omitted password=os.environ.get("GRID_CLIENT_SECRET"), # This is the default and can be omitted ) incoming_transaction = client.sandbox.uma.receive_payment( receiving_currency_amount=1000, receiving_currency_code="USD", sender_uma_address="$success.usd@sandbox.grid.uma.money", ) print(incoming_transaction.id) - lang: Kotlin source: >- package com.lightspark.grid.example import com.lightspark.grid.client.LightsparkGridClient import com.lightspark.grid.client.okhttp.LightsparkGridOkHttpClient import com.lightspark.grid.models.sandbox.uma.UmaReceivePaymentParams import com.lightspark.grid.models.transactions.IncomingTransaction fun main() { val client: LightsparkGridClient = LightsparkGridOkHttpClient.fromEnv() val params: UmaReceivePaymentParams = UmaReceivePaymentParams.builder() .receivingCurrencyAmount(1000L) .receivingCurrencyCode("USD") .senderUmaAddress("\$success.usd@sandbox.grid.uma.money") .build() val incomingTransaction: IncomingTransaction = client.sandbox().uma().receivePayment(params) } components: schemas: SandboxUmaReceiveRequest: type: object required: - senderUmaAddress - receivingCurrencyCode - receivingCurrencyAmount properties: senderUmaAddress: type: string description: UMA address of the sender from the sandbox example: $success.usd@sandbox.grid.uma.money receiverUmaAddress: type: string description: UMA address of the receiver (optional if customerId is provided) example: $receiver@uma.domain customerId: type: string description: >- System ID of the receiver (optional if receiverUmaAddress is provided) example: Customer:019542f5-b3e7-1d02-0000-000000000001 receivingCurrencyCode: type: string description: The currency code for the receiving amount example: USD receivingCurrencyAmount: type: integer format: int64 description: >- The amount to be received in the smallest unit of the currency (eg. cents) exclusiveMinimum: 0 example: 1000 IncomingTransaction: title: Incoming Transaction allOf: - $ref: '#/components/schemas/Transaction' - type: object required: - type - receivedAmount properties: type: type: string enum: - INCOMING source: $ref: '#/components/schemas/TransactionSourceOneOf' receivedAmount: $ref: '#/components/schemas/CurrencyAmount' description: Amount received in the recipient's currency reconciliationInstructions: $ref: '#/components/schemas/ReconciliationInstructions' description: Included for all transactions except those with "CREATED" status rateDetails: $ref: '#/components/schemas/IncomingRateDetails' description: Details about the rate and fees for the transaction. failureReason: $ref: '#/components/schemas/IncomingTransactionFailureReason' description: >- If the transaction failed, this field provides the reason for failure. Error400: type: object required: - message - status - code properties: status: type: integer enum: - 400 description: HTTP status code code: type: string description: > | Error Code | Description | |------------|-------------| | INVALID_INPUT | Invalid input provided | | MISSING_MANDATORY_USER_INFO | Required customer information is missing | | INVITATION_ALREADY_CLAIMED | Invitation has already been claimed | | INVITATIONS_NOT_CONFIGURED | Invitations are not configured | | INVALID_UMA_ADDRESS | UMA address format is invalid | | INVITATION_CANCELLED | Invitation has been cancelled | | QUOTE_REQUEST_FAILED | An issue occurred during the quote process; this is retryable | | INVALID_PAYREQ_RESPONSE | Counterparty Payreq response was invalid | | INVALID_RECEIVER | Receiver is invalid | | PARSE_PAYREQ_RESPONSE_ERROR | Error parsing receiver PayReq response | | CERT_CHAIN_INVALID | Counterparty certificate chain is invalid | | CERT_CHAIN_EXPIRED | Counterparty certificate chain has expired | | INVALID_PUBKEY_FORMAT | Counterparty Public key format is invalid | | MISSING_REQUIRED_UMA_PARAMETERS | Counterparty required UMA parameters are missing | | SENDER_NOT_ACCEPTED | Sender is not accepted | | AMOUNT_OUT_OF_RANGE | Amount is out of range | | INVALID_CURRENCY | Currency is invalid | | INVALID_TIMESTAMP | Timestamp is invalid | | INVALID_NONCE | Nonce is invalid | | INVALID_REQUEST_FORMAT | Request format is invalid | | INVALID_BANK_ACCOUNT | Bank account is invalid | | SELF_PAYMENT | Self payment not allowed | | LOOKUP_REQUEST_FAILED | Lookup request failed | | PARSE_LNURLP_RESPONSE_ERROR | Error parsing LNURLP response | | INVALID_AMOUNT | Amount is invalid | | WEBHOOK_ENDPOINT_NOT_SET | Webhook endpoint is not set | | WEBHOOK_DELIVERY_ERROR | Webhook delivery error | | LOW_QUALITY | Document quality too low to process | | DATA_MISMATCH | Document details don't match provided information | | EXPIRED | Document has expired | | SUSPECTED_FRAUD | Document suspected of being forged or edited | | UNSUITABLE_DOCUMENT | Document type is not accepted or not supported | | INCOMPLETE | Document is missing pages or sides | enum: - INVALID_INPUT - MISSING_MANDATORY_USER_INFO - INVITATION_ALREADY_CLAIMED - INVITATIONS_NOT_CONFIGURED - INVALID_UMA_ADDRESS - INVITATION_CANCELLED - QUOTE_REQUEST_FAILED - INVALID_PAYREQ_RESPONSE - INVALID_RECEIVER - PARSE_PAYREQ_RESPONSE_ERROR - CERT_CHAIN_INVALID - CERT_CHAIN_EXPIRED - INVALID_PUBKEY_FORMAT - MISSING_REQUIRED_UMA_PARAMETERS - SENDER_NOT_ACCEPTED - AMOUNT_OUT_OF_RANGE - INVALID_CURRENCY - INVALID_TIMESTAMP - INVALID_NONCE - INVALID_REQUEST_FORMAT - INVALID_BANK_ACCOUNT - SELF_PAYMENT - LOOKUP_REQUEST_FAILED - PARSE_LNURLP_RESPONSE_ERROR - INVALID_AMOUNT - WEBHOOK_ENDPOINT_NOT_SET - WEBHOOK_DELIVERY_ERROR - LOW_QUALITY - DATA_MISMATCH - EXPIRED - SUSPECTED_FRAUD - UNSUITABLE_DOCUMENT - INCOMPLETE message: type: string description: Error message details: type: object description: Additional error details additionalProperties: true Error401: type: object required: - message - status - code properties: status: type: integer enum: - 401 description: HTTP status code code: type: string description: | | Error Code | Description | |------------|-------------| | UNAUTHORIZED | Issue with API credentials | | INVALID_SIGNATURE | Signature header is invalid | enum: - UNAUTHORIZED - INVALID_SIGNATURE message: type: string description: Error message details: type: object description: Additional error details additionalProperties: true Error403: type: object required: - message - status - code properties: status: type: integer enum: - 403 description: HTTP status code code: type: string description: > | Error Code | Description | |------------|-------------| | FORBIDDEN | Insufficient permissions | | USER_NOT_READY | Customer exists but is not ready for operation | | COUNTERPARTY_NOT_ALLOWED | Counterparty has not been enabled for your account | | VELOCITY_LIMIT_EXCEEDED | Counterparty has exceeded velocity limits | enum: - FORBIDDEN - USER_NOT_READY - COUNTERPARTY_NOT_ALLOWED - VELOCITY_LIMIT_EXCEEDED message: type: string description: Error message details: type: object description: Additional error details additionalProperties: true Error404: type: object required: - message - status - code properties: status: type: integer enum: - 404 description: HTTP status code code: type: string description: | | Error Code | Description | |------------|-------------| | TRANSACTION_NOT_FOUND | Transaction not found | | INVITATION_NOT_FOUND | Invitation not found | | USER_NOT_FOUND | Customer not found | | QUOTE_NOT_FOUND | Quote not found | | LOOKUP_REQUEST_NOT_FOUND | Lookup request not found | | TOKEN_NOT_FOUND | Token not found | | BULK_UPLOAD_JOB_NOT_FOUND | Bulk upload job not found | | REFERENCE_NOT_FOUND | Reference not found | enum: - TRANSACTION_NOT_FOUND - INVITATION_NOT_FOUND - USER_NOT_FOUND - QUOTE_NOT_FOUND - LOOKUP_REQUEST_NOT_FOUND - TOKEN_NOT_FOUND - BULK_UPLOAD_JOB_NOT_FOUND - REFERENCE_NOT_FOUND message: type: string description: Error message details: type: object description: Additional error details additionalProperties: true Error500: type: object required: - message - status - code properties: status: type: integer enum: - 500 description: HTTP status code code: type: string description: | | Error Code | Description | |------------|-------------| | GRID_SWITCH_ERROR | Grid switch error | | INTERNAL_ERROR | Internal server or UMA error | enum: - GRID_SWITCH_ERROR - INTERNAL_ERROR message: type: string description: Error message details: type: object description: Additional error details additionalProperties: true Transaction: type: object required: - id - status - type - destination - customerId - platformCustomerId properties: id: type: string description: Unique identifier for the transaction example: Transaction:019542f5-b3e7-1d02-0000-000000000004 status: $ref: '#/components/schemas/TransactionStatus' type: $ref: '#/components/schemas/TransactionType' destination: $ref: '#/components/schemas/TransactionDestinationOneOf' customerId: type: string description: >- System ID of the customer (sender for outgoing, recipient for incoming) example: Customer:019542f5-b3e7-1d02-0000-000000000001 platformCustomerId: type: string description: >- Platform-specific ID of the customer (sender for outgoing, recipient for incoming) example: 18d3e5f7b4a9c2 settledAt: type: string format: date-time description: When the payment was or will be settled example: '2025-08-15T14:30:00Z' createdAt: type: string format: date-time description: When the transaction was created example: '2025-08-15T14:25:18Z' updatedAt: type: string format: date-time description: When the transaction was last updated example: '2025-08-15T14:30:00Z' description: type: string description: Optional memo or description for the payment example: 'Payment for invoice #1234' counterpartyInformation: $ref: '#/components/schemas/CounterpartyInformation' TransactionSourceOneOf: oneOf: - $ref: '#/components/schemas/AccountTransactionSource' - $ref: '#/components/schemas/UmaAddressTransactionSource' - $ref: '#/components/schemas/RealtimeFundingTransactionSource' discriminator: propertyName: sourceType mapping: ACCOUNT: $ref: '#/components/schemas/AccountTransactionSource' UMA_ADDRESS: $ref: '#/components/schemas/UmaAddressTransactionSource' REALTIME_FUNDING: $ref: '#/components/schemas/RealtimeFundingTransactionSource' CurrencyAmount: type: object required: - amount - currency properties: amount: type: integer format: int64 description: >- Amount in the smallest unit of the currency (e.g., cents for USD/EUR, satoshis for BTC) example: 12550 currency: $ref: '#/components/schemas/Currency' ReconciliationInstructions: type: object required: - reference properties: reference: type: string description: >- Unique reference code that must be included with the payment to match it with the correct incoming transaction example: UMA-Q12345-REF IncomingRateDetails: description: Details about the rate and fees for an incoming transaction. type: object required: - gridApiMultiplier - gridApiFixedFee - gridApiVariableFeeRate - gridApiVariableFeeAmount properties: gridApiMultiplier: type: number format: double description: >- The underlying multiplier from the mSATS to the receiving currency, including variable fees. exclusiveMinimum: 0 example: 0.925 gridApiFixedFee: type: integer format: int64 description: >- The fixed fee charged by the Grid product to execute the quote in the smallest unit of the receiving currency (eg. cents). minimum: 0 example: 10 gridApiVariableFeeRate: type: number format: double description: >- The variable fee rate charged by the Grid product to execute the quote as a percentage of the receiving currency amount. minimum: 0 example: 0.003 gridApiVariableFeeAmount: type: number format: int64 description: >- The variable fee amount charged by the Grid product to execute the quote in the smallest unit of the receiving currency (eg. cents). This is the receiving amount times gridApiVariableFeeRate. minimum: 0 example: 30 IncomingTransactionFailureReason: type: string enum: - LNURLP_FAILED - PAY_REQUEST_FAILED - PAYMENT_APPROVAL_WEBHOOK_ERROR - PAYMENT_APPROVAL_TIMED_OUT - OFFRAMP_FAILED - MISSING_MANDATORY_PAYEE_DATA - QUOTE_EXPIRED - QUOTE_EXECUTION_FAILED description: >- Reason for failure of an incoming transaction. This is used to provide more context on why a transaction failed. If the transaction is not in a failed state, this field is omitted. TransactionStatus: type: string enum: - CREATED - PENDING - PROCESSING - COMPLETED - REJECTED - FAILED - REFUNDED - EXPIRED description: > Status of a payment transaction. | Status | Description | |--------|-------------| | `CREATED` | Initial lookup has been created | | `PENDING` | Quote has been created | | `PROCESSING` | Funding has been received and payment initiated | | `COMPLETED` | Cross border payment has been received, converted and payment has been sent to the offramp network | | `REJECTED` | Receiving institution or wallet rejected payment, payment has been refunded | | `FAILED` | An error occurred during payment | | `REFUNDED` | Payment was unable to complete and refunded | | `EXPIRED` | Quote has expired | TransactionType: type: string enum: - INCOMING - OUTGOING description: Type of transaction (incoming payment or outgoing payment) TransactionDestinationOneOf: oneOf: - $ref: '#/components/schemas/AccountTransactionDestination' - $ref: '#/components/schemas/UmaAddressTransactionDestination' discriminator: propertyName: destinationType mapping: ACCOUNT: $ref: '#/components/schemas/AccountTransactionDestination' UMA_ADDRESS: $ref: '#/components/schemas/UmaAddressTransactionDestination' CounterpartyInformation: type: object description: >- Additional information about the counterparty, if available and relevant to the transaction and platform. additionalProperties: true example: FULL_NAME: John Sender BIRTH_DATE: '1985-06-15' NATIONALITY: DE AccountTransactionSource: title: Account Source allOf: - $ref: '#/components/schemas/BaseTransactionSource' - type: object required: - accountId - sourceType properties: sourceType: type: string enum: - ACCOUNT accountId: type: string description: Source account identifier example: InternalAccount:e85dcbd6-dced-4ec4-b756-3c3a9ea3d965 description: Source account details UmaAddressTransactionSource: title: UMA Address Source allOf: - $ref: '#/components/schemas/BaseTransactionSource' - type: object required: - umaAddress - sourceType properties: sourceType: type: string enum: - UMA_ADDRESS umaAddress: type: string description: UMA address of the sender example: $sender@uma.domain.com description: UMA address source details RealtimeFundingTransactionSource: title: Real-time Funding Source allOf: - $ref: '#/components/schemas/BaseTransactionSource' - type: object required: - currency - sourceType properties: sourceType: type: string enum: - REALTIME_FUNDING customerId: type: string description: The customer on whose behalf the transaction was initiated. example: Customer:019542f5-b3e7-1d02-0000-000000000009 currency: type: string description: Currency code for the funding source example: USDC description: >- Transaction was funded using a real-time funding source (RTP, SEPA Instant, Spark, Stables, etc.). Currency: type: object properties: code: type: string description: >- Three-letter currency code (ISO 4217) for fiat currencies. Some cryptocurrencies may use their own ticker symbols (e.g. "BTC" for Bitcoin, "USDC" for USDC, etc.) example: USD name: type: string description: Full name of the currency example: United States Dollar symbol: type: string description: Symbol of the currency example: $ decimals: type: integer description: Number of decimal places for the currency minimum: 0 example: 2 AccountTransactionDestination: title: Account Destination allOf: - $ref: '#/components/schemas/BaseTransactionDestination' - type: object required: - accountId - destinationType properties: destinationType: type: string enum: - ACCOUNT accountId: type: string description: Destination account identifier example: ExternalAccount:a12dcbd6-dced-4ec4-b756-3c3a9ea3d123 description: Destination account details UmaAddressTransactionDestination: title: UMA Address Destination allOf: - $ref: '#/components/schemas/BaseTransactionDestination' - type: object required: - umaAddress - destinationType properties: destinationType: type: string enum: - UMA_ADDRESS umaAddress: type: string description: UMA address of the recipient example: $receiver@uma.domain.com description: UMA address destination details BaseTransactionSource: type: object required: - sourceType properties: sourceType: $ref: '#/components/schemas/TransactionSourceType' currency: type: string description: Currency code for the source example: USD BaseTransactionDestination: type: object required: - destinationType properties: destinationType: $ref: '#/components/schemas/TransactionDestinationType' currency: type: string description: Currency code for the destination example: EUR TransactionSourceType: type: string enum: - ACCOUNT - UMA_ADDRESS - REALTIME_FUNDING description: Type of transaction source example: ACCOUNT TransactionDestinationType: type: string enum: - ACCOUNT - UMA_ADDRESS description: Type of transaction destination example: ACCOUNT securitySchemes: BasicAuth: type: http scheme: basic description: >- API token authentication using format `:` ````