> ## Documentation Index > Fetch the complete documentation index at: https://docs.dueflow.co/llms.txt > Use this file to discover all available pages before exploring further. # Save a member's mailing address for collections > > **Requires scope** `members:read` · `members:write` · `payments:read` · `payments:write` · **Minimum role** editor FCS needs a complete US mailing address before a member can be placed. Debt collections (First Credit Services) is chapter-only and behind a feature flag; organizations without it get 404. [Scopes and roles](https://docs.dueflow.co/api-reference/scopes) ## OpenAPI ````yaml /openapi.json post /v1/collections/members/{memberId}/mailing-address openapi: 3.1.0 info: title: Dueflow API version: 1.0.0 description: >- Read and write your organization's Dueflow data. Authenticate with a personal access token or an organization service token as a bearer credential; cookies are ignored. Every endpoint is also a tool on the Dueflow MCP server at https://api.dueflow.co/mcp, which accepts the same bearer tokens or an OAuth connection from ChatGPT and Claude. termsOfService: https://dueflow.co/terms contact: name: Dueflow support email: support@dueflow.co url: https://docs.dueflow.co servers: - url: https://api.dueflow.co description: Production security: - bearerAuth: [] paths: /v1/collections/members/{memberId}/mailing-address: post: tags: - Collections summary: Save a member's mailing address for collections description: >- > **Requires scope** `members:read` · `members:write` · `payments:read` · `payments:write` · **Minimum role** editor FCS needs a complete US mailing address before a member can be placed. Debt collections (First Credit Services) is chapter-only and behind a feature flag; organizations without it get 404. [Scopes and roles](https://docs.dueflow.co/api-reference/scopes) operationId: postCollectionsMembersByMemberIdMailing-address parameters: - name: memberId in: path required: true schema: type: string - name: Idempotency-Key in: header required: true description: >- A unique key per logical operation, e.g. a UUID. Retrying with the same key replays the original response instead of repeating the write; reusing it with different parameters is a 409. schema: type: string maxLength: 255 requestBody: required: true content: application/json: schema: type: object properties: line1: type: string minLength: 1 maxLength: 120 line2: type: string maxLength: 120 city: type: string minLength: 1 maxLength: 80 state: type: string minLength: 2 maxLength: 2 postalCode: type: string minLength: 5 maxLength: 10 required: - line1 - city - state - postalCode responses: '201': description: Success content: application/json: schema: type: object properties: memberId: type: string eligibleBalanceCents: anyOf: - type: integer minimum: -9007199254740991 maximum: 9007199254740991 - type: 'null' estimatedNetCents: anyOf: - type: integer minimum: -9007199254740991 maximum: 9007199254740991 - type: 'null' daysOverdue: type: integer minimum: -9007199254740991 maximum: 9007199254740991 blockers: type: array items: type: string missingContact: type: boolean finalWarningSentAt: anyOf: - type: string format: date-time - type: 'null' warningDeadlineAt: anyOf: - type: string format: date-time - type: 'null' canSendFinalWarning: type: boolean canSubmitReferral: type: boolean openPlacement: anyOf: - type: object properties: id: type: string status: type: string fcsStatus: anyOf: - type: object properties: code: type: string description: anyOf: - type: string - type: 'null' date: anyOf: - type: string - type: 'null' required: - code - description - date additionalProperties: false - type: 'null' required: - id - status - fcsStatus additionalProperties: false - type: 'null' timeline: type: array items: type: object properties: at: type: string format: date-time kind: type: string detail: anyOf: - type: string - type: 'null' required: - at - kind - detail additionalProperties: false required: - memberId - eligibleBalanceCents - estimatedNetCents - daysOverdue - blockers - missingContact - finalWarningSentAt - warningDeadlineAt - canSendFinalWarning - canSubmitReferral - openPlacement - timeline additionalProperties: false '401': description: Missing, malformed, expired or revoked token. content: application/json: schema: $ref: '#/components/schemas/Error' '403': description: The token lacks a required scope. content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: No such resource, or the token's organization can't see it. content: application/json: schema: $ref: '#/components/schemas/Error' '409': description: >- The write conflicts with existing state, or an `Idempotency-Key` was reused with different parameters. content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: Rate limited; see the `Retry-After` header. content: application/json: schema: $ref: '#/components/schemas/Error' security: - bearerAuth: - members:read - members:write - payments:read - payments:write components: schemas: Error: type: object properties: error: type: object properties: code: type: string message: type: string param: type: string requiredScopes: type: array items: type: string requestId: type: string docsUrl: type: string required: - code - message - requestId - docsUrl additionalProperties: false required: - error additionalProperties: false securitySchemes: bearerAuth: type: http scheme: bearer description: >- A Dueflow access token: `dfp_` (personal) or `dfs_` (service). Permissions are the token's scopes intersected with the role ceiling, re-evaluated per request. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.