> ## Documentation Index > Fetch the complete documentation index at: https://docs.lerian.studio/llms.txt > Use this file to discover all available pages before exploring further. # Get installment series > Installment series lookup is not available on this service. A request that passes authentication, authorization and parameter validation is answered with 501 Not Implemented. A request refused earlier keeps its own status: 401 or 403 for authentication and authorization, and 400 PBP-0001 when series_id is not a UUID. ## OpenAPI ````yaml /pt/openapi/v3-current/payments.yaml get /v1/boletos/installments/{series_id} openapi: 3.1.0 info: description: >- API for the Lerian Payments interface via BTG. It covers boleto issuance, cancellation, and queries; bill payments (bankslip, utilities, and DARF) and queries; aggregated boleto and payment dashboards; provider connection and outbound webhook configuration; and the provider webhook receiver for settlement events. ERROR BODIES. A failed request arrives in one of two shapes, and which one you get depends on where the service catches the failure. A failure that the request pipeline catches before the API layer sees it answers a flat JSON body on application/json; the idempotency check is the pipeline rule you meet most often. Authentication and authorization refusals follow the response contract documented by the operation. Everything the API layer catches answers an RFC 9457 problem document on application/problem+json. Read the media type to tell the two apart. Branch on the code member. A license refusal carries an LCS code, listed in the License Manager error list. title: Payments — via BTG API version: 1.0.0 servers: - url: https://api.example.com description: >- Replace the example host with the URL provided during environment onboarding. security: [] tags: - description: >- Tenant-level setup: connecting the banking provider and configuring where status notifications are delivered. name: Admin - description: Issuing, querying and cancelling boletos, and retrieving the rendered PDF. name: Boletos - description: >- Aggregated counts, amounts and breakdowns over a period, for boletos and for payments. name: Dashboards - description: >- Paying bankslips, utility bills and DARF tax slips, and querying those payments. name: Payments - description: >- The webhook the payment provider posts settlement events to. Authenticated with a credential agreed with the provider, not with the platform identity used by the rest of this API. name: Settlement paths: /v1/boletos/installments/{series_id}: get: tags: - Boletos summary: Get installment series description: >- Installment series lookup is not available on this service. A request that passes authentication, authorization and parameter validation is answered with 501 Not Implemented. A request refused earlier keeps its own status: 401 or 403 for authentication and authorization, and 400 PBP-0001 when series_id is not a UUID. operationId: getInstallmentSeries parameters: - description: >- Tenant organization ID. Optional. The organization context is determined by the credentials you authenticate with; this header does not select or change it. in: header name: X-Organization-Id schema: description: >- Tenant organization ID. Optional. The organization context is determined by the credentials you authenticate with; this header does not select or change it. type: string - description: Installment series identifier (UUID). in: path name: series_id required: true schema: description: Installment series identifier (UUID). examples: - 123e4567-e89b-12d3-a456-426614174000 format: uuid type: string responses: '200': content: application/json: schema: $ref: '#/components/schemas/GetInstallmentsResponse' description: >- Not returned: this operation is unavailable and answers 501 Not Implemented. '400': content: application/problem+json: schema: $ref: '#/components/schemas/Detail' description: Bad Request '401': content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' application/problem+json: schema: $ref: '#/components/schemas/Detail' text/plain: schema: type: string description: >- Authentication failed: the request carries no valid credential, or the credential does not identify a tenant. The error body is either `application/json` with error code `PBP-0003` or `application/problem+json` (RFC 9457); read the `Content-Type` to parse it. The `text/plain` media type listed for this status is not returned. Obtain a valid bearer token and send the request again. '403': content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' text/plain: schema: type: string description: >- The authenticated principal is not allowed to perform this request. The error body is `application/json` with error code `PBP-0004`: the principal lacks permission for this operation, and the permission has to be granted before the request can succeed. The `text/plain` media type listed for this status is not returned. '404': content: application/problem+json: schema: $ref: '#/components/schemas/Detail' description: Not Found '422': content: application/problem+json: schema: $ref: '#/components/schemas/Detail' description: Unprocessable Entity '500': content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' application/problem+json: schema: $ref: '#/components/schemas/Detail' description: Internal Server Error '501': content: application/problem+json: schema: $ref: '#/components/schemas/Detail' description: >- Not Implemented. Installment boletos are not available on this service: every request that passes authentication, authorization and request validation is answered this way. The response body carries `code` PBP-0109 and a `detail` saying that installment boletos are not available. No installment series is created or read. Do not retry. '503': description: >- Service Unavailable. PBP-0008 means the tenant's storage could not be resolved. The request was not processed. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' security: - BearerAuth: [] components: schemas: GetInstallmentsResponse: additionalProperties: false properties: boletos: items: $ref: '#/components/schemas/InstallmentBoletoResponse' type: - array - 'null' installmentsCount: format: int64 type: integer seriesId: type: string status: type: string totalAmount: type: string required: - seriesId - status - totalAmount - installmentsCount - boletos type: object Detail: additionalProperties: true properties: code: description: >- Stable, machine-readable domain error code scoped to the emitting service (format: -NNNN). type: string detail: description: >- A human-readable explanation specific to this occurrence of the problem. examples: - Property foo is required but is missing. type: string errors: description: Optional list of individual error details items: $ref: '#/components/schemas/ErrorDetail' type: - array - 'null' instance: description: >- A URI reference that identifies the specific occurrence of the problem. examples: - https://example.com/error-log/abc123 format: uri type: string status: description: HTTP status code examples: - 400 format: int64 type: integer title: description: >- A short, human-readable summary of the problem type. This value should not change between occurrences of the error. examples: - Bad Request type: string type: default: about:blank description: A URI reference to human-readable documentation for the error. examples: - https://example.com/errors/example format: uri type: string upstream: $ref: '#/components/schemas/Upstream' description: >- RFC 9457 extension member: the error a proxied third-party provider reported. Absent unless the emitting service explicitly surfaced one. type: object ErrorResponse: additionalProperties: false properties: code: type: string details: additionalProperties: {} type: object message: type: string title: type: string required: - code - title - message type: object InstallmentBoletoResponse: additionalProperties: false properties: amount: type: string dueDate: type: string id: type: string installmentLabel: type: string installmentNumber: format: int64 type: integer status: type: string required: - id - installmentNumber - installmentLabel - amount - dueDate - status type: object ErrorDetail: additionalProperties: false properties: location: description: >- Where the error occurred, e.g. 'body.items[3].tags' or 'path.thing-id' type: string message: description: Error message text type: string value: description: The value at the given location type: object Upstream: additionalProperties: false properties: code: description: The upstream provider's own error code, verbatim. examples: - E4001 type: string message: description: >- The upstream provider's own error message, verbatim (bounded, never its raw response body). examples: - account not found at provider type: string type: object securitySchemes: BearerAuth: bearerFormat: JWT description: JWT bearer token issued by the identity provider. scheme: bearer type: http ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.