> ## Documentation Index > Fetch the complete documentation index at: https://docs.portalhq.io/llms.txt > Use this file to discover all available pages before exploring further. # Create Meld customer > Registers the authenticated Portal client as a Meld customer. Returns `409 Conflict` if a Meld customer already exists for this client — use `GET /customers` instead. ## OpenAPI ````yaml /openapi/client-api.yaml post /clients/me/integrations/meld/customers openapi: 3.1.0 info: title: Portal Client API version: '3.0' description: > The Portal Client API provides endpoints for managing wallets, building transactions, and interacting with blockchain networks. All endpoints require authentication via a Client API Key or Client Session Token (CST) passed as a Bearer token. ## Base URL `https://api.portalhq.io/api/v3` ## Authentication Include your Client API Key or Client Session Token as a Bearer token in the `Authorization` header of every request. ## Chain ID Format Chain parameters use either friendly names (e.g. `ethereum`, `solana`) or CAIP-2 format (e.g. `eip155:1`, `solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp`). When using CAIP-2 format in URLs, ensure the colon is URI-encoded (`%3A`). servers: - url: https://api.portalhq.io/api/v3 description: Production security: - bearerAuth: [] tags: - name: Clients description: Core client management endpoints - name: Wallet description: >- Read wallet state — balances, NFTs, transaction history, capabilities, and transaction details - name: Transactions description: Build, broadcast, and evaluate blockchain transactions - name: Funding description: Fund wallets with testnet tokens - name: Wallet Shares description: Manage signing and backup share pairs - name: Delegations description: Manage token approvals, revocations, and delegated transfers - name: Session Keys description: Manage EIP-7702 session keys for smart accounts - name: 0x description: Token swap endpoints powered by the 0x protocol - name: Yield.xyz description: Yield opportunities and staking actions powered by Yield.xyz - name: Li.Fi description: Cross-chain swaps and bridging powered by Li.Fi - name: Blockaid description: Transaction and address security scanning powered by Blockaid - name: Hypernative description: >- Transaction, address, token, and NFT security scanning powered by Hypernative - name: Noah description: KYC onboarding, payins, and payouts powered by Noah - name: Meld description: Buy and sell crypto with fiat through aggregated providers powered by Meld - name: EIP-7702 description: EIP-7702 account type detection and authorization management - name: Deprecated description: >- Legacy endpoints scheduled for removal. Use the newer equivalents listed in each endpoint's description. paths: /clients/me/integrations/meld/customers: post: tags: - Meld summary: Create Meld customer description: | Registers the authenticated Portal client as a Meld customer. Returns `409 Conflict` if a Meld customer already exists for this client — use `GET /customers` instead. operationId: createMeldCustomer requestBody: required: false content: application/json: schema: $ref: '#/components/schemas/MeldCreateCustomerRequest' responses: '200': description: Meld customer created successfully content: application/json: schema: $ref: '#/components/schemas/MeldCustomerResponse' '400': description: Bad request content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': description: Unauthorized content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '409': description: Meld customer already exists for this client content: application/json: schema: $ref: '#/components/schemas/MeldCustomerConflictResponse' components: schemas: MeldCreateCustomerRequest: type: object description: All fields are optional. properties: name: $ref: '#/components/schemas/MeldCustomerName' email: type: string format: email phone: type: string description: E.164-formatted phone number. dateOfBirth: type: string format: date description: ISO-8601 calendar date (YYYY-MM-DD). type: type: string enum: - INDIVIDUAL - BUSINESS MeldCustomerResponse: type: object properties: data: $ref: '#/components/schemas/MeldCustomer' ErrorResponse: type: object properties: error: type: string description: Error message describing what went wrong MeldCustomerConflictResponse: type: object properties: error: type: string description: Human-readable conflict message. details: type: object properties: meldCustomerId: type: string description: The existing Meld customer ID for this Portal client. MeldCustomerName: type: object properties: firstName: type: string lastName: type: string MeldCustomer: type: object required: - id - accountId - externalId properties: id: type: string accountId: type: string externalId: type: string name: $ref: '#/components/schemas/MeldCustomerName' email: type: string phone: type: string dateOfBirth: type: string type: type: string enum: - INDIVIDUAL - BUSINESS status: type: string enum: - ACTIVE - INACTIVE addresses: type: array items: $ref: '#/components/schemas/MeldCustomerAddress' serviceProviders: type: object additionalProperties: true MeldCustomerAddress: type: object properties: id: type: string customerId: type: string type: type: string enum: - BILLING - SHIPPING - RESIDENCE status: type: string enum: - ACTIVE - INACTIVE addressDetails: $ref: '#/components/schemas/MeldCustomerAddressDetails' MeldCustomerAddressDetails: type: object properties: lineOne: type: string lineTwo: type: string city: type: string region: type: string postalCode: type: string country: type: string securitySchemes: bearerAuth: type: http scheme: bearer description: > Client API Key or Client Session Token (CST). Pass as a Bearer token in the Authorization header. ````