Code knowledge base · 2026-10-28

Learn from the example app.

Ask the docs can use 548 excerpts from 72 reviewed files. The current Flutter implementation covers Crypto cards, Banking and Exchange, including client methods, UI flows, models and matching C# backend controllers.

Flutter snapshot cd46c2d09324 is based on revision ce45c9c3bbde and includes 0 reviewed local changes. Source links open immutable snapshots with original line numbers. Supporting public examples remain pinned to example_app revision f512e9c32fea.

The Flutter and Vue apps call their own backend under /api/v1/mobile and /api/v1/mor. The C# backend calls Hoppa’s company-scoped public API. Keep these layers separate and keep your company API key on the server. Examples illustrate an implementation; the current OpenAPI contract takes priority if they disagree.

Unified onboarding, Banking controls and evidence →

Open the interactive setup and styling guide →

Try asking “Show the Flutter and C# implementation of card auto top-up”, “Build a Banking payout with OTP”, or “Implement Exchange verification and explicit funding in Flutter”.

Learn from the example app.

Customer app setup studio and export

App styling colors logos and fonts

Customer installation backend database and deployment

C# MOR merchant users cards funding

C# MOR assigned cardholder controls and loads

Vue MOR backend client and origin confinement

MOR public API mapping and roles

C# backend · Card ordering activation freeze PIN limits load unload secure widget

C# backend · Card auto top-up low balance deposit and failed transaction

C# backend · Banking accounts onboarding payees payout quote OTP confirmation and FX

C# backend · Exchange verification activation settlement quote accept funding payout transfer decisions

C# backend · Personal KYC SumSub hosted SDK reusable identity verification

C# backend · Business KYB onboarding evidence requirements compliance people documents

C# backend · Crypto withdrawals OTP transfers and Quantum conversion

C# backend · Crypto wallet balances deposit addresses and supported networks

C# backend · User onboarding gates status approval and tiers

C# backend · Tier discovery and card products

C# Hoppa HTTP client company-key boundary and error handling

C# upstream Hoppa proxy mapping and request validation

C# upstream Hoppa proxy mapping and request validation

Flutter Dart API · Platform client: Exchange verification quotes funding transfers, card controls, business onboarding

Flutter Dart API · Banking client: cards ordering funding, accounts payees payout quotes OTP and business KYB

Flutter Dart API · Card auto top-up client and settings

Flutter Dart API · KYC client for SumSub verification

Flutter Dart API · SumSub KYC SDK launch and completion adapter

Flutter Dart API · Authenticated Flutter HTTP requests token refresh and backend boundary

Flutter UI · Order virtual or physical card after tier and approval checks

Flutter UI · Card controls freeze secure details top-up unload

Flutter UI · Auto top-up UI consent deposit and low balance settings

Flutter UI · Edit card spending limits

Flutter UI · Set card PIN with validation

Flutter UI · Personal Banking onboarding form and documents

Flutter UI · Payee creation and Banking payouts with quote OTP confirm

Flutter UI · Business KYB and Banking onboarding steps

Flutter UI · Personal KYC screen and SumSub flow

Flutter UI · Crypto withdrawal fee quote destination and OTP confirmation

Flutter UI · Crypto wallet deposit and withdrawal actions

Flutter UI · Exchange verification activation application SumSub reuse TIN EDD readiness

Flutter UI · Exchange activate and choose limits actions

Flutter UI · Exchange verification limits selection

Flutter UI · Exchange business KYB authorisation

Flutter UI · Exchange quote review accept explicit funding payout and card delivery

Flutter UI · Exchange quote approval funds keep return and transfer status

Flutter UI · Exchange bank and crypto payout destination validation

Flutter UI · Exchange settlement bank deposit details and readiness

Flutter UI · Exchange funding address exact currency and network

Flutter UI · Exchange entry point accounts eligibility and verification

Flutter models · Platform resource status and account models

Flutter models · Banking payout quote OTP cards accounts and payee models

Flutter models · Provider-specific card controls and limits

Flutter models · Card funding balance selection

Flutter models · Card limit models and validation

Flutter models · Card PIN validation

Flutter models · Exchange balances verification quotes and workflow state models

Flutter models · Exact crypto currency network and budget balance routing

Flutter models · Exchange funding payout and quote limits validation

Flutter models · Crypto withdrawal OTP and fee models

Flutter models · Crypto withdrawal exact network selection

Flutter models · Bank payee details and draft validation

Unified CDD and Banking implementation checklist

Unified CDD saved questionnaire and provider progress

Invite approval, code redemption and Stripe onboarding gate

Current agreements and existing customer review navigator

Scroll-to-bottom legal document review

Name-check result and mismatch acknowledgement

Assigned Banking fees and billing

Customer complaints and forwarding status

Owned authenticated CDD proxy and selected services

Invite and onboarding requirement proxy

Idempotent complaint record and forwarding queue

Tenant-scoped active/default admin legal settings

Interactive customer setup and styling guide