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class="chartlet-focus"><summary>Focus</summary><fieldset><label><input type="radio" name="chartlet-79335aff9fa623ac-focus" checked> Show all</label><label><input type="radio" name="chartlet-79335aff9fa623ac-focus" class="chartlet-focus-node" id="chartlet-79335aff9fa623ac-focus-0"> Customer</label><label><input type="radio" name="chartlet-79335aff9fa623ac-focus" class="chartlet-focus-node" id="chartlet-79335aff9fa623ac-focus-1"> Customer portal</label><label><input type="radio" name="chartlet-79335aff9fa623ac-focus" class="chartlet-focus-node" id="chartlet-79335aff9fa623ac-focus-2"> API gateway</label><label><input type="radio" name="chartlet-79335aff9fa623ac-focus" class="chartlet-focus-node" id="chartlet-79335aff9fa623ac-focus-3"> Monolith</label><label><input type="radio" name="chartlet-79335aff9fa623ac-focus" class="chartlet-focus-node" id="chartlet-79335aff9fa623ac-focus-4"> Billing service</label><label><input type="radio" name="chartlet-79335aff9fa623ac-focus" class="chartlet-focus-node" id="chartlet-79335aff9fa623ac-focus-5"> Invoice events</label><label><input type="radio" name="chartlet-79335aff9fa623ac-focus" class="chartlet-focus-node" id="chartlet-79335aff9fa623ac-focus-6"> Accounts</label><label><input type="radio" name="chartlet-79335aff9fa623ac-focus" class="chartlet-focus-node" id="chartlet-79335aff9fa623ac-focus-7"> Payment provider</label></fieldset></details><figure class="chartlet-figure" data-viz="chart"><figcaption>Billing moves from the monolith to its own service</figcaption><div class="chartlet-stage"><svg xmlns="http://www.w3.org/2000/svg" width="1400" height="452" viewBox="0 0 1400 452" id="chartlet-79335aff9fa623ac" role="img" aria-labelledby="chartlet-79335aff9fa623ac-title chartlet-79335aff9fa623ac-description" class="chartlet-root"><title id="chartlet-79335aff9fa623ac-title">Billing moves from the monolith to its own service</title><desc id="chartlet-79335aff9fa623ac-description">Architecture diagram with 8 components and 8 connections in 1 boundary. Platform: API gateway, Monolith, Billing service, Invoice events, Accounts. Most connected: Billing service (4 connections). Nothing leads into Customer. Nothing leads out of Invoice events, Accounts and Payment provider. Bottleneck: API gateway; without it the diagram falls apart. Customer (person): connects to Customer portal (pays). Customer portal (frontend): connects to API gateway (calls, via HTTPS). API gateway (security): connects to Monolith (routes today) and Billing service (routes after). Monolith (service): connects to Accounts (via SQL). Billing service (service): connects to Accounts (via SQL), Invoice events (publishes) and Payment provider (charges, via HTTPS). Accounts (database): no outgoing connection. Invoice events (queue): no outgoing connection. Payment provider (external system): no outgoing connection. Roles: critical: API gateway, Accounts, Billing service → Payment provider; planned: Billing service, Invoice events, API gateway → Billing service, Billing service → Accounts, Billing service → Invoice events; deprecated: Monolith, API gateway → Monolith, Monolith → Accounts.</desc><style>.chartlet-root{--chartlet-text:#172033;--chartlet-muted:#344054;--chartlet-grid:#d9dee8;--chartlet-zero:#667085;--chartlet-accent:#2563eb;--chartlet-background:#fff;--chartlet-color-1:#2563eb;--chartlet-color-2:#c2410c;--chartlet-color-3:#475569;--chartlet-color-4:#111827;max-width:100%;height:auto;font-family:Inter,ui-sans-serif,system-ui,sans-serif;color:var(--chartlet-text)}#chartlet-79335aff9fa623ac .chartlet-title{font-size:22px;font-weight:650;fill:var(--chartlet-text)}#chartlet-79335aff9fa623ac .chartlet-label,#chartlet-79335aff9fa623ac .chartlet-tick,#chartlet-79335aff9fa623ac .chartlet-value,#chartlet-79335aff9fa623ac .chartlet-value-inverse,#chartlet-79335aff9fa623ac 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class="chartlet-arch-dot"/><text x="295.686" y="213.8" text-anchor="middle" class="chartlet-flow-label">Customer portal</text></g><g class="chartlet-f chartlet-n-2 chartlet-f-1 chartlet-f-2 chartlet-f-3 chartlet-f-4 chartlet-flow-role-critical"><polyline points="511.97,178.8 616.83,178.8 616.83,211.2 564.4,232.8 511.97,211.2 511.97,178.8" class="chartlet-diagram-shadow"/><polyline points="511.97,176.3 616.83,176.3 616.83,208.7 564.4,230.3 511.97,208.7 511.97,176.3" class="chartlet-flow-node chartlet-role-red"><title>API gateway</title></polyline><text x="564.4" y="201.8" text-anchor="middle" class="chartlet-flow-label">API gateway</text><circle cx="511.97" cy="176.3" r="8" class="chartlet-diagram-badge"/><text x="511.97" y="179.8" text-anchor="middle" class="chartlet-diagram-badge-text">!</text></g><g class="chartlet-f chartlet-n-3 chartlet-f-2 chartlet-f-3 chartlet-f-6 chartlet-flow-role-deprecated"><rect x="799.879" y="136.5" width="104" height="50" class="chartlet-diagram-shadow"/><rect x="799.879" y="134" width="104" height="50" class="chartlet-flow-node chartlet-role-blue"><title>Monolith – billing module</title></rect><text x="851.879" y="156.5" text-anchor="middle" class="chartlet-flow-label">Monolith</text><text x="851.879" y="170.5" text-anchor="middle" class="chartlet-flow-sublabel">billing module</text><circle cx="799.879" cy="134" r="8" class="chartlet-diagram-badge"/><text x="799.879" y="137.5" text-anchor="middle" class="chartlet-diagram-badge-text">−</text></g><g class="chartlet-f chartlet-n-4 chartlet-f-2 chartlet-f-4 chartlet-f-5 chartlet-f-6 chartlet-f-7 chartlet-flow-role-planned"><rect x="794.574" y="215.3" width="114.61" height="68" class="chartlet-diagram-shadow"/><rect x="794.574" y="212.8" width="114.61" height="68" class="chartlet-flow-node chartlet-role-blue"><title>Billing service</title></rect><text x="851.879" y="251.3" text-anchor="middle" class="chartlet-flow-label">Billing service</text><circle cx="794.574" cy="212.8" r="8" class="chartlet-diagram-badge"/><text x="794.574" y="216.3" text-anchor="middle" class="chartlet-diagram-badge-text">+</text></g><g class="chartlet-f chartlet-n-5 chartlet-f-4 chartlet-f-5 chartlet-flow-role-planned"><rect x="1073.976" y="215.5" width="116.04" height="36" class="chartlet-diagram-shadow"/><rect x="1073.976" y="213" width="116.04" height="36" class="chartlet-flow-node chartlet-role-violet"/><rect x="1069.976" y="219.5" width="116.04" height="36" class="chartlet-diagram-shadow"/><rect x="1069.976" y="217" width="116.04" height="36" class="chartlet-flow-node chartlet-role-violet"><title>Invoice events</title></rect><text x="1127.996" y="239.5" text-anchor="middle" class="chartlet-flow-label">Invoice events</text><circle cx="1069.976" cy="217" r="8" class="chartlet-diagram-badge"/><text x="1069.976" y="220.5" text-anchor="middle" class="chartlet-diagram-badge-text">+</text></g><g class="chartlet-f chartlet-n-6 chartlet-f-3 chartlet-f-4 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chartlet-role-teal"><title>Accounts – Postgres</title></polyline><polyline points="1075.996,134 1077.768,135.294 1082.963,136.5 1091.227,137.536 1101.996,138.33 1114.538,138.83 1127.996,139 1141.455,138.83 1153.996,138.33 1164.766,137.536 1173.03,136.5 1178.225,135.294 1179.996,134" class="chartlet-diagram-rim"/><text x="1127.996" y="159.5" text-anchor="middle" class="chartlet-flow-label">Accounts</text><text x="1127.996" y="173.5" text-anchor="middle" class="chartlet-flow-sublabel">Postgres</text><circle cx="1075.996" cy="129" r="8" class="chartlet-diagram-badge"/><text x="1075.996" y="132.5" text-anchor="middle" class="chartlet-diagram-badge-text">!</text></g><g class="chartlet-f chartlet-n-7 chartlet-f-4 chartlet-f-7"><rect x="1236.17" y="281.5" width="139.83" height="36" class="chartlet-diagram-shadow"/><rect x="1236.17" y="279" width="139.83" height="36" class="chartlet-flow-node chartlet-flow-external chartlet-role-gray"><title>Payment provider</title></rect><text x="1306.085" y="301.5" text-anchor="middle" class="chartlet-flow-label">Payment provider</text></g><g class="chartlet-flow-role-critical"><circle cx="32" cy="434" r="8" class="chartlet-diagram-badge"/><text x="32" y="437.5" text-anchor="middle" class="chartlet-diagram-badge-text">!</text><line x1="46" y1="434" x2="68" y2="434" class="chartlet-flow-edge"/></g><text x="74" y="438" text-anchor="start" class="chartlet-legend">Critical</text><g class="chartlet-flow-role-planned"><circle cx="147.72" cy="434" r="8" class="chartlet-diagram-badge"/><text x="147.72" y="437.5" text-anchor="middle" class="chartlet-diagram-badge-text">+</text><line x1="161.72" y1="434" x2="183.72" y2="434" class="chartlet-flow-edge"/></g><text x="189.72" y="438" text-anchor="start" class="chartlet-legend">Planned</text><g class="chartlet-flow-role-deprecated"><circle cx="262.96" cy="434" r="8" class="chartlet-diagram-badge"/><text x="262.96" y="437.5" text-anchor="middle" class="chartlet-diagram-badge-text">−</text><line x1="276.96" y1="434" x2="298.96" y2="434" class="chartlet-flow-edge"/></g><text x="304.96" y="438" text-anchor="start" class="chartlet-legend">Deprecated</text></svg><label class="chartlet-hotspot" id="chartlet-79335aff9fa623ac-hs-0" for="chartlet-79335aff9fa623ac-focus-0"></label><label class="chartlet-hotspot" id="chartlet-79335aff9fa623ac-hs-1" for="chartlet-79335aff9fa623ac-focus-1"></label><label class="chartlet-hotspot" id="chartlet-79335aff9fa623ac-hs-2" for="chartlet-79335aff9fa623ac-focus-2"></label><label class="chartlet-hotspot" id="chartlet-79335aff9fa623ac-hs-3" for="chartlet-79335aff9fa623ac-focus-3"></label><label class="chartlet-hotspot" id="chartlet-79335aff9fa623ac-hs-4" for="chartlet-79335aff9fa623ac-focus-4"></label><label class="chartlet-hotspot" id="chartlet-79335aff9fa623ac-hs-5" for="chartlet-79335aff9fa623ac-focus-5"></label><label class="chartlet-hotspot" id="chartlet-79335aff9fa623ac-hs-6" for="chartlet-79335aff9fa623ac-focus-6"></label><label class="chartlet-hotspot" id="chartlet-79335aff9fa623ac-hs-7" for="chartlet-79335aff9fa623ac-focus-7"></label></div><p class="chartlet-source">Source: Architecture review, migration plan</p><details class="chartlet-data" data-viz-text><summary>Show chart data</summary><table><caption>Data for Billing moves from the monolith to its own service</caption><thead><tr><th scope="col">Component</th><th scope="col">Kind</th><th scope="col">Boundary</th><th scope="col">Role</th><th scope="col">Connects to</th></tr></thead><tbody><tr><th scope="row">Customer</th><td>person</td><td></td><td></td><td>Customer portal (pays)</td></tr><tr><th scope="row">Customer portal</th><td>frontend</td><td></td><td></td><td>API gateway (calls, via HTTPS)</td></tr><tr><th scope="row">API gateway</th><td>security</td><td>Platform</td><td>critical</td><td>Monolith (routes today, deprecated), Billing service (routes after, planned)</td></tr><tr><th scope="row">Monolith</th><td>service</td><td>Platform</td><td>deprecated</td><td>Accounts (via SQL, deprecated)</td></tr><tr><th scope="row">Billing service</th><td>service</td><td>Platform</td><td>planned</td><td>Accounts (via SQL, planned), Invoice events (publishes, planned), Payment provider (charges, via HTTPS, critical)</td></tr><tr><th scope="row">Accounts</th><td>database</td><td>Platform</td><td>critical</td><td></td></tr><tr><th scope="row">Invoice events</th><td>queue</td><td>Platform</td><td>planned</td><td></td></tr><tr><th scope="row">Payment provider</th><td>external system</td><td></td><td></td><td></td></tr></tbody></table></details></figure></div>