---
title: "Changes to Sandbox: Create an interest payment"
method: POST
path: "/simulations/interest_payments"
---

# Changes to Sandbox: Create an interest payment

`POST /simulations/interest_payments`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 5 of 34 revisions.

- **2026-09-23** `6977819ad74c` — 1 info
- **2026-09-20** `e3458b10162d` — 2 warning
- **2026-09-19** `f02c8a861724` — 2 info
- **2026-09-15** `e1ee909f1683` — 2 warning, 2 info
- **2026-09-04** `e73761b43130` — 1 warning, 1 info

## Changes

- **2026-09-23** `6977819ad74c` — 1 info
  - added the required property `source/inbound_wire_transfer/anyOf[subschema #1: Transaction Transaction Source Inbound Wire Transfer Intention]/instruction_for_creditor_agent` to the response with the `200` status
- **2026-09-20** `e3458b10162d` — 2 warning
  - added the new `ethanol_7_7_blend` enum value to the `source/card_refund/anyOf[subschema #1: Card Refund]/purchase_details/anyOf[subschema #1: Card Refund Card Purchase Details]/fleet/anyOf[subschema #1: Card Refund Card Purchase Details Fleet]/fuel_type/anyOf[subschema #1]/` response property for the response status `200`
  - added the new `ethanol_7_7_blend` enum value to the `source/card_settlement/anyOf[subschema #1: Card Settlement]/purchase_details/anyOf[subschema #1: Card Settlement Card Purchase Details]/fleet/anyOf[subschema #1: Card Settlement Card Purchase Details Fleet]/fuel_type/anyOf[subschema #1]/` response property for the response status `200`
- **2026-09-19** `f02c8a861724` — 2 info
  - added the required property `source/card_refund/anyOf[subschema #1: Card Refund]/purchase_details/anyOf[subschema #1: Card Refund Card Purchase Details]/fleet` to the response with the `200` status
  - added the required property `source/card_settlement/anyOf[subschema #1: Card Settlement]/purchase_details/anyOf[subschema #1: Card Settlement Card Purchase Details]/fleet` to the response with the `200` status
- **2026-09-15** `e1ee909f1683` — 2 warning, 2 info
  - added the new `sepa_instant_transfer_acceptance` enum value to the `source/category` response property for the response status `200`
  - added the new `uk_faster_payment_system_transfer_acceptance` enum value to the `source/category` response property for the response status `200`
  - added the optional property `source/sepa_instant_transfer_acceptance` to the response with the `200` status
  - added the optional property `source/uk_faster_payment_system_transfer_acceptance` to the response with the `200` status
- **2026-09-04** `e73761b43130` — 1 warning, 1 info
  - added the new `fednow_transfer_return` enum value to the `source/category` response property for the response status `200`
  - added the optional property `source/fednow_transfer_return` to the response with the `200` status

---

[Operation](https://skmtc.dev/increase/apis/increase-api-2/docs/simulations/interest_payments/post.md) · [API](https://skmtc.dev/increase/apis/increase-api-2.md) · [Page](https://skmtc.dev/increase/apis/increase-api-2/changes/simulations/interest_payments/post)