Technical producer focus
Turn the purchase into named states and transitions. Separate the player-facing prototype from identity, persistence, native billing, security, and refund work.
Technical Producer guide · Desktop Web Games · Koin purchase UX
Technical Producer Guide to Koin Inventory Delivery for Desktop Web Games
Use a playable web prototype to work through inventory delivery for desktop web games. The goal is to make the player journey concrete before the team commits to native commerce implementation.
Create this game flow
Define the desktop web games scope
Platform context
Design for the input, layout, interruption, and return behavior players expect from desktop web games.
Prototype boundary
Desktop browser purchases remain Koin flows inside the supported experience.
Inventory Delivery in practice
Starting state
Show one non-required item, its preview, specific Koin amount, current Koin balance, and ownership rule in a layout suited to desktop web games.
Main task
Write how to connect successful purchase to a visible owned or quantity state. Keep each change visible to the player rather than hiding it in technical state.
Recovery
Make cancellation, not enough Koin, pending, interrupted delivery, and reload visually distinct, with a safe next action.
Role decision
Map preview, confirmation, cancelling the action, an insufficient balance, pending, success, delivery, owned, and reload. Give every failure a safe next action. Use the prototype to resolve player-facing questions before creating platform integration tasks.
Solve the inventory delivery details
Support keyboard and pointer
For a technical producer, this inventory delivery prototype should make every player action and player-visible outcome easy to evaluate. Write how to connect successful purchase to a visible owned or quantity state. Map preview, confirmation, cancelling the action, an insufficient balance, pending, success, delivery, owned, and reload. Give every failure a safe next action. Check tab order, focus indicators, mouse targets, escape behavior, and the return to game controls. Confirmation must never borrow an input that also performs a high-frequency gameplay action.
Plan for wide layouts
Keep the item, Koin amount, balance effect, and actions together on common desktop widths. Avoid pushing a player cancellation off screen simply because the game canvas occupies a large area.
Test window changes
Resize, move between displays, zoom, refresh, and restore a background tab. The interaction should preserve the selected item and resolve pending or delivered states without another grant.
Name every state and owner
Separate preview, confirmation, pending, success, delivery, owned, insufficient Koin, cancel, interrupted, and reopened states. Assign later production work for identity, persistence, native billing, security, refunds, policy, and monitoring.
Define idempotent recovery
Repeated confirmation, a slow response, navigation during delivery, and reopening must resolve to one result. Record which state is authoritative and how the player can safely retry without another grant or Koin deduction.
Turn the prototype into tickets
Capture the visible behavior first, then create implementation tasks with expected examples for each transition and platform boundary. Do not translate a working browser interaction into an unsupported claim that backend commerce is complete.
Connect success to the item
A success message is not delivery. Place the cosmetic, consumable, unlock, or upgrade in the screen where the player expects to use it. Test that behavior using desktop web games. Desktop browser purchases remain Koin flows inside the supported experience.
Show ownership and quantity
Use owned, equipped, unlocked, or remaining quantity as appropriate. The state should match the promise made on the offer card. Test that behavior using desktop web games. Desktop browser purchases remain Koin flows inside the supported experience.
Verify delivery after reload
Reload the prototype and return to inventory. The item should remain visible without subtracting Koin or granting a second copy. Test that behavior using desktop web games. Desktop browser purchases remain Koin flows inside the supported experience.
Prototype the player journey
1. Set the platform context
Choose the input and screen behavior for desktop web games. State the platform limit beside the prototype brief.
Result: An honest scope
2. Map inventory delivery
Write how to connect successful purchase to a visible owned or quantity state. Describe the player action and visible response at each point.
Result: A clear inventory delivery sequence
3. Add the Koin choice
Show the item, exact price, balance, confirm, cancel, pending, success, and delivery without payment-provider screens.
Result: A complete player journey
4. Apply the technical producer lens
Map preview, confirmation, cancellation, not enough Koin, pending, success, delivery, owned, and reload. Give every failure a safe next action.
Result: Technical producer focus
5. Test return and recovery
Interrupt delivery, repeat the input, and reload. The prototype should never grant twice or leave the player in an unexplained state. Repeat the test after interruption and reload.
Result: A stable prototype
Generate the desktop web games prototype
Prompt 1
Create keyboard-and-mouse browser play for a technical producer. Focus the IAP prototype on connect successful purchase to a visible owned or quantity state. Use a direct Koin item transaction with preview, exact price, confirmation, cancel, insufficient balance, success, delivery, and reload behavior. The technical producer must be able to name every state, owner, failure path, and expected check. Do not add subscriptions, payment-provider UI, revenue analytics, or native platform claims. State this boundary: Desktop browser purchases remain Koin flows inside the supported experience.
Prompt 2
Keep the item optional. Show its specific Koin amount, current Koin balance, confirm, cancel, low-balance, success, visible delivery, and reload states.
Technical Producer test checklist
- The inventory delivery sequence feels natural for desktop web games.
- The technical producer can make the intended decision from the playable result.
- The item, Koin price, and balance appear before the player confirms.
- Cancel, too little Koin, pending, success, and reload have different outcomes.
- The page states this boundary: Desktop browser purchases remain Koin flows inside the supported experience.
- Interrupt delivery, repeat the input, and reload. The prototype should never grant twice or leave the player in an unexplained state.
Limits for desktop web games
- Desktop browser purchases remain Koin flows inside the supported experience.
- This guide uses a direct Koin transaction for one optional game item. It does not create a subscription or recurring charge.
- The result is a playable web prototype. Native billing, identity, durable entitlements, security, refunds, and store approval need separate implementation.
- SEELE does not provide payment analytics, tax tools, payout reports, or guaranteed revenue through this flow.
Frequently asked questions
What does inventory delivery mean here?
Write how to connect successful purchase to a visible owned or quantity state. The result is shown as a playable Koin flow.
Is this a subscription?
No. The player spends Koin directly on one named item or unlock.
What happens if the player cancels?
Return to the same game state without spending Koin or delivering the item.
What if the Koin balance is too low?
Explain the shortage, preserve progress, and do not deliver the item.
Does this include payment or revenue reports?
No. It covers the player-facing purchase experience, not financial reporting.
Is the prototype ready for a native store?
No. Desktop browser purchases remain Koin flows inside the supported experience.
Create the inventory delivery prototype
Open the complete prompt in SEELE, adjust the item and Koin price, then generate a playable version you can test.
Open this prompt in Workspace