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Mono Direct Debit API

Customers, mandates, balance inquiry, and recurring debits.

Mono Direct Debit API is one of 11 APIs that Mono publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Direct Debit. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

This API exposes 5 operations across 4 paths, and defines 9 schemas. It is described by OpenAPI 3.2.0, at version 2.0.

Requests are made against a single base URL, https://api.withmono.com.

5 operations 4 paths 9 schemas 2 GET3 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
2.0
Base URL
https://api.withmono.com
Authentication
API Key
Terms of Service
Resource Areas
1

Authentication & Security 1

Mono Direct Debit API declares 1 security scheme for authenticating requests. An API key is passed in the header as mono-sec-key (monoSecKey). By default, every request must be authenticated.

  • monoSecKey — Secret application key issued in the Mono dashboard.

Paths & Operations 5

Across 4 paths, the API surfaces 5 operations — 2 GET, 3 POST. Each is listed below with its method, path, parameters, and response codes.

Direct Debit 5

Customers, mandates, balance inquiry, and recurring debits.

POST
/v2/customers
Create a customer
createCustomer body → 201401
GET
/v2/customers
List customers
listCustomers 1 param → 200401
POST
/v2/payments/initiate-mandate
Initiate mandate authorisation
initiateMandate body → 200401
GET
/v3/payments/mandates/{id}/balance
Mandate balance inquiry
mandateBalanceInquiry 1 param → 200401
POST
/v3/payments/mandates/{id}/debit
Debit a mandate
debitMandate 1 param body → 200401404

Schemas 9

The contract defines 9 schemas that model the data the API accepts and returns. The most detailed are InitiateMandateRequest (14 properties), CreateCustomerRequest (8 properties), Customer (3 properties), CustomerList (3 properties). Each schema is shown below with its type and property counts.

InitiateMandateRequest
object
14 properties 4 required
Error
object
2 properties
Balance
object
3 properties
DebitMandateRequest
object
3 properties 2 required
PaymentStatus
object
3 properties
InitiateMandateResponse
object
3 properties
CustomerList
object
3 properties
CreateCustomerRequest
object
8 properties
Customer
object
3 properties

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

mono-co-direct-debit-api-openapi.yml Raw ↑

Other APIs Mono publishes across the network.

Mono Account Information API
Mono Account Linking API
Mono DirectPay API
Mono Identity and Income API
Mono Transactions and Statements API
Mono Connect API
Mono Creditworthiness API
Mono Financial Data API
Mono Investment API
Mono Lookup API
Where this information came from

This is an independent, third-party profile of Mono Direct Debit API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.

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