> ## Documentation Index > Fetch the complete documentation index at: https://docs.getlago.com/llms.txt > Use this file to discover all available pages before exploring further. # Delete a metadata > This endpoint removes a single metadata key from a credit note. ## OpenAPI ````yaml DELETE /credit_notes/{lago_id}/metadata/{key} openapi: 3.1.0 info: title: Lago API documentation description: >- Lago API allows your application to push customer information and metrics (events) from your application to the billing application. version: 1.46.0 license: name: AGPLv3 url: https://github.com/getlago/lago-openapi/blob/main/LICENSE contact: email: tech@getlago.com servers: - url: https://api.getlago.com/api/v1 description: US Lago cluster - url: https://api.eu.getlago.com/api/v1 description: EU Lago cluster security: - bearerAuth: [] tags: - name: activity_logs description: Everything about Activity logs externalDocs: description: Find out more url: https://getlago.com/docs/api-reference/audit-logs/activity-logs-object - name: analytics description: Everything about Analytics - name: api_logs description: Everything about API logs externalDocs: description: Find out more url: https://getlago.com/docs/api-reference/audit-logs/api-logs-object - name: billable_metrics description: Everything about Billable metric collection externalDocs: description: Find out more url: https://getlago.com/docs/api-reference/billable-metrics/object - name: features description: Everything about Feature collection externalDocs: description: Find out more url: >- https://getlago.com/docs/api-reference/entitlements/features/feature-object - name: entitlements description: Everything about Entitlement collection externalDocs: description: Find out more url: >- https://getlago.com/docs/api-reference/entitlements/plan-entitlements/plan-entitlement-object - name: billing_entities description: Everything about Billing Entities externalDocs: description: Find out more url: https://getlago.com/docs/api-reference/billing-entities/object - name: customers description: Everything about Customer collection externalDocs: description: Find out more url: https://getlago.com/docs/api-reference/customers/object - name: plans description: Everything about Plan collection externalDocs: description: Find out more url: https://getlago.com/docs/api-reference/plans/object - name: subscriptions description: Everything about Subscription collection externalDocs: description: Find out more url: https://getlago.com/docs/api-reference/subscriptions/subscription-object - name: events description: Everything about Event collection externalDocs: description: Find out more url: https://getlago.com/docs/api-reference/events/event-object - name: organizations description: Everything about Organization collection externalDocs: description: Find out more url: https://getlago.com/docs/api-reference/organizations/organization-object - name: taxes description: Everything about Tax collection externalDocs: description: Find out more url: https://getlago.com/docs/api-reference/taxes/tax-object - name: coupons description: Everything about Coupon collection externalDocs: description: Find out more url: https://getlago.com/docs/api-reference/coupons/coupon-object - name: add_ons description: Everything about Add-on collection externalDocs: description: Find out more url: https://getlago.com/docs/api-reference/add-ons/add-on-object - name: fees description: Everything about Fees externalDocs: description: Find out more url: >- https://getlago.com/docs/api-reference/invoices/invoice-object#fee-object - name: invoices description: Everything about Invoice collection externalDocs: description: Find out more url: https://getlago.com/docs/api-reference/invoices/invoice-object - name: wallets description: Everything about Wallet collection externalDocs: description: Find out more url: https://getlago.com/docs/api-reference/wallets/wallet-object - name: credit_notes description: Everything about Credit notes collection externalDocs: description: Find out more url: https://getlago.com/docs/api-reference/credit-notes/credit-note-object - name: webhooks description: Everything about Webhooks externalDocs: description: Find out more url: >- https://getlago.com/docs/api-reference/webhooks/format---signature#1-retrieve-the-public-key - name: webhook_endpoints description: Everything about Webhook Endpoints externalDocs: description: Find out more url: >- https://getlago.com/docs/api-reference/webhook-endpoints/webhook-endpoint-object - name: payment_receipts description: Everything about Payment receipts externalDocs: description: Find out more url: >- https://getlago.com/docs/api-reference/payment-receipts/payment-receipt-object - name: payment_requests description: Everything about PaymentRequests externalDocs: description: Find out more url: >- https://getlago.com/docs/api-reference/payment-requests/payment-request-object - name: payments description: Everything about Payments externalDocs: description: Find out more url: https://getlago.com/docs/api-reference/payments/payment-object - name: payment_methods description: Everything about Payment Methods externalDocs: description: Find out more url: >- https://getlago.com/docs/api-reference/payment-methods/payment-method-object externalDocs: description: Lago Github url: https://github.com/getlago paths: /credit_notes/{lago_id}/metadata/{key}: delete: tags: - credit_notes summary: Delete a metadata key description: This endpoint removes a single metadata key from a credit note. operationId: deleteCreditNoteMetadataKey parameters: - name: lago_id in: path description: The credit note unique identifier, created by Lago. required: true schema: type: string format: uuid example: 1a901a90-1a90-1a90-1a90-1a901a901a90 - name: key in: path description: The metadata key to delete. required: true schema: type: string example: external_id responses: '200': description: Metadata key deleted content: application/json: schema: $ref: '#/components/schemas/CreditNoteMetadataResponse' '401': $ref: '#/components/responses/Unauthorized' '404': $ref: '#/components/responses/NotFound' components: schemas: CreditNoteMetadataResponse: type: object required: - metadata properties: metadata: $ref: '#/components/schemas/MetadataObject' MetadataObject: type: - object - 'null' description: >- Custom metadata stored as key-value pairs. Keys are strings (max 100 characters), values can be strings (max 255 characters) or null. additionalProperties: type: - string - 'null' example: external_id: ext-123 synced_at: '2024-01-15' source: null ApiErrorUnauthorized: type: object required: - status - error properties: status: type: integer format: int32 example: 401 error: type: string example: Unauthorized ApiErrorNotFound: type: object required: - status - error - code properties: status: type: integer format: int32 example: 404 error: type: string example: Not Found code: type: string example: object_not_found responses: Unauthorized: description: Unauthorized error content: application/json: schema: $ref: '#/components/schemas/ApiErrorUnauthorized' NotFound: description: Not Found error content: application/json: schema: $ref: '#/components/schemas/ApiErrorNotFound' securitySchemes: bearerAuth: type: http scheme: bearer ````