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Teller Examples

This project contains a simple front-end and multiple back-end implementations for enrolling bank accounts and experimenting with the Teller API

Quick Start

Run the Python back-end (default):

make APP_ID=app_xxx

Visit http://localhost:8001.

Other Languages

If you want to try a different back-end, specify the language:

make run node APP_ID=app_xxx
make run ruby APP_ID=app_xxx
make run go APP_ID=app_xxx
make run elixir APP_ID=app_xxx
make run php APP_ID=app_xxx
make run dotnet APP_ID=app_xxx
make run java APP_ID=app_xxx

Each implementation lives under $REPO_ROOT/<language_name>/ with a run.sh.

Requirements

The only system-level requirements are:

  • macOS: Homebrew must be installed
  • Linux: apt must be available (Debian/Ubuntu based distributions)

The run.sh scripts will use Homebrew on macOS and apt on Linux to install any missing runtimes automatically on first run.

Environment

  • APP_ID (required) — your Teller application ID
  • ENV (optional, default: sandbox) — set to development or production for live data
  • CERT and CERT_KEY - your Teller Application certificate and private key (required only when ENV is development or production)

Example (Java with mTLS in development):

make run java APP_ID=app_xxx ENV=development CERT=/path/to/cert.pem CERT_KEY=/path/to/key.pem

Usage

  1. Start a back-end with make run … as shown above.
  2. Open http://localhost:8001 in your browser.
  3. Click Connect (top right) to enroll a user with Teller Connect.
  4. After connecting, you’ll see accounts. Use the buttons to fetch Details, Balances, Transactions, and (for checking) manage Payees and Payments.
  5. The bottom bar shows the enrolled User ID and the Access Token used for API calls.

Sandbox Credentials

Use username username and password password to enroll a sandbox account.

See the Sandbox Guide: https://teller.io/docs/guides/sandbox for additional test credentials and flows (OTP, knowledge-based MFA, etc.).

About

No description, website, or topics provided.

Resources

Readme
Activity
Custom properties

Stars

26 stars

Watchers

4 watching

Forks

11 forks
Report repository

Releases

Packages

Used by

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Teller Examples
This project contains a simple front-end and multiple back-end implementations
for enrolling bank accounts and experimenting with the Teller API
Quick Start
Run the Python back-end (default):
make APP_ID=app_xxx
Visit http://localhost:8001.
Other Languages
If you want to try a different back-end, specify the language:
make run node APP_ID=app_xxx
make run ruby APP_ID=app_xxx
make run go APP_ID=app_xxx
make run elixir APP_ID=app_xxx
make run php APP_ID=app_xxx
make run dotnet APP_ID=app_xxx
make run java APP_ID=app_xxx
Each implementation lives under $REPO_ROOT/<language_name>/ with a run.sh.
Requirements
The only system-level requirements are:
  • macOS: Homebrew must be installed
  • Linux: apt must be available (Debian/Ubuntu based distributions)
The run.sh scripts will use Homebrew on macOS and apt on Linux to install any
missing runtimes automatically on first run.
Environment
  • APP_ID (required) — your Teller application ID
  • ENV (optional, default: sandbox) — set to development or production for live data
  • CERT and CERT_KEY - your Teller Application certificate and private key (required only when ENV is development or production)
Example (Java with mTLS in development):
make run java APP_ID=app_xxx ENV=development CERT=/path/to/cert.pem CERT_KEY=/path/to/key.pem
Usage
  1. Start a back-end with make run … as shown above.
  2. Open http://localhost:8001 in your browser.
  3. Click Connect (top right) to enroll a user with Teller Connect.
  4. After connecting, you’ll see accounts. Use the buttons to fetch Details, Balances, Transactions, and (for checking) manage Payees and Payments.
  5. The bottom bar shows the enrolled User ID and the Access Token used for API calls.
Sandbox Credentials
Use username username and password password to enroll a sandbox account.
See the Sandbox Guide: https://teller.io/docs/guides/sandbox for additional test credentials and flows (OTP, knowledge-based MFA, etc.).
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
26 stars
Watchers
4 watching
Forks
11 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Teller Examples
This project contains a simple front-end and multiple back-end implementations
for enrolling bank accounts and experimenting with the Teller API
Quick Start
Run the Python back-end (default):
make APP_ID=app_xxx
Visit http://localhost:8001.
Other Languages
If you want to try a different back-end, specify the language:
make run node APP_ID=app_xxx
make run ruby APP_ID=app_xxx
make run go APP_ID=app_xxx
make run elixir APP_ID=app_xxx
make run php APP_ID=app_xxx
make run dotnet APP_ID=app_xxx
make run java APP_ID=app_xxx
Each implementation lives under $REPO_ROOT/<language_name>/ with a run.sh.
Requirements
The only system-level requirements are:
  • macOS: Homebrew must be installed
  • Linux: apt must be available (Debian/Ubuntu based distributions)
The run.sh scripts will use Homebrew on macOS and apt on Linux to install any
missing runtimes automatically on first run.
Environment
  • APP_ID (required) — your Teller application ID
  • ENV (optional, default: sandbox) — set to development or production for live data
  • CERT and CERT_KEY - your Teller Application certificate and private key (required only when ENV is development or production)
Example (Java with mTLS in development):
make run java APP_ID=app_xxx ENV=development CERT=/path/to/cert.pem CERT_KEY=/path/to/key.pem
Usage
  1. Start a back-end with make run … as shown above.
  2. Open http://localhost:8001 in your browser.
  3. Click Connect (top right) to enroll a user with Teller Connect.
  4. After connecting, you’ll see accounts. Use the buttons to fetch Details, Balances, Transactions, and (for checking) manage Payees and Payments.
  5. The bottom bar shows the enrolled User ID and the Access Token used for API calls.
Sandbox Credentials
Use username username and password password to enroll a sandbox account.
See the Sandbox Guide: https://teller.io/docs/guides/sandbox for additional test credentials and flows (OTP, knowledge-based MFA, etc.).
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
26 stars
Watchers
4 watching
Forks
11 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Teller Examples
This project contains a simple front-end and multiple back-end implementations
for enrolling bank accounts and experimenting with the Teller API
Quick Start
Run the Python back-end (default):
make APP_ID=app_xxx
Visit http://localhost:8001.
Other Languages
If you want to try a different back-end, specify the language:
make run node APP_ID=app_xxx
make run ruby APP_ID=app_xxx
make run go APP_ID=app_xxx
make run elixir APP_ID=app_xxx
make run php APP_ID=app_xxx
make run dotnet APP_ID=app_xxx
make run java APP_ID=app_xxx
Each implementation lives under $REPO_ROOT/<language_name>/ with a run.sh.
Requirements
The only system-level requirements are:
  • macOS: Homebrew must be installed
  • Linux: apt must be available (Debian/Ubuntu based distributions)
The run.sh scripts will use Homebrew on macOS and apt on Linux to install any
missing runtimes automatically on first run.
Environment
  • APP_ID (required) — your Teller application ID
  • ENV (optional, default: sandbox) — set to development or production for live data
  • CERT and CERT_KEY - your Teller Application certificate and private key (required only when ENV is development or production)
Example (Java with mTLS in development):
make run java APP_ID=app_xxx ENV=development CERT=/path/to/cert.pem CERT_KEY=/path/to/key.pem
Usage
  1. Start a back-end with make run … as shown above.
  2. Open http://localhost:8001 in your browser.
  3. Click Connect (top right) to enroll a user with Teller Connect.
  4. After connecting, you’ll see accounts. Use the buttons to fetch Details, Balances, Transactions, and (for checking) manage Payees and Payments.
  5. The bottom bar shows the enrolled User ID and the Access Token used for API calls.
Sandbox Credentials
Use username username and password password to enroll a sandbox account.
See the Sandbox Guide: https://teller.io/docs/guides/sandbox for additional test credentials and flows (OTP, knowledge-based MFA, etc.).
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
26 stars
Watchers
4 watching
Forks
11 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Teller Examples
This project contains a simple front-end and multiple back-end implementations
for enrolling bank accounts and experimenting with the Teller API
Quick Start
Run the Python back-end (default):
make APP_ID=app_xxx
Visit http://localhost:8001.
Other Languages
If you want to try a different back-end, specify the language:
make run node APP_ID=app_xxx
make run ruby APP_ID=app_xxx
make run go APP_ID=app_xxx
make run elixir APP_ID=app_xxx
make run php APP_ID=app_xxx
make run dotnet APP_ID=app_xxx
make run java APP_ID=app_xxx
Each implementation lives under $REPO_ROOT/<language_name>/ with a run.sh.
Requirements
The only system-level requirements are:
  • macOS: Homebrew must be installed
  • Linux: apt must be available (Debian/Ubuntu based distributions)
The run.sh scripts will use Homebrew on macOS and apt on Linux to install any
missing runtimes automatically on first run.
Environment
  • APP_ID (required) — your Teller application ID
  • ENV (optional, default: sandbox) — set to development or production for live data
  • CERT and CERT_KEY - your Teller Application certificate and private key (required only when ENV is development or production)
Example (Java with mTLS in development):
make run java APP_ID=app_xxx ENV=development CERT=/path/to/cert.pem CERT_KEY=/path/to/key.pem
Usage
  1. Start a back-end with make run … as shown above.
  2. Open http://localhost:8001 in your browser.
  3. Click Connect (top right) to enroll a user with Teller Connect.
  4. After connecting, you’ll see accounts. Use the buttons to fetch Details, Balances, Transactions, and (for checking) manage Payees and Payments.
  5. The bottom bar shows the enrolled User ID and the Access Token used for API calls.
Sandbox Credentials
Use username username and password password to enroll a sandbox account.
See the Sandbox Guide: https://teller.io/docs/guides/sandbox for additional test credentials and flows (OTP, knowledge-based MFA, etc.).
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
26 stars
Watchers
4 watching
Forks
11 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Teller Examples
This project contains a simple front-end and multiple back-end implementations
for enrolling bank accounts and experimenting with the Teller API
Quick Start
Run the Python back-end (default):
make APP_ID=app_xxx
Visit http://localhost:8001.
Other Languages
If you want to try a different back-end, specify the language:
make run node APP_ID=app_xxx
make run ruby APP_ID=app_xxx
make run go APP_ID=app_xxx
make run elixir APP_ID=app_xxx
make run php APP_ID=app_xxx
make run dotnet APP_ID=app_xxx
make run java APP_ID=app_xxx
Each implementation lives under $REPO_ROOT/<language_name>/ with a run.sh.
Requirements
The only system-level requirements are:
  • macOS: Homebrew must be installed
  • Linux: apt must be available (Debian/Ubuntu based distributions)
The run.sh scripts will use Homebrew on macOS and apt on Linux to install any
missing runtimes automatically on first run.
Environment
  • APP_ID (required) — your Teller application ID
  • ENV (optional, default: sandbox) — set to development or production for live data
  • CERT and CERT_KEY - your Teller Application certificate and private key (required only when ENV is development or production)
Example (Java with mTLS in development):
make run java APP_ID=app_xxx ENV=development CERT=/path/to/cert.pem CERT_KEY=/path/to/key.pem
Usage
  1. Start a back-end with make run … as shown above.
  2. Open http://localhost:8001 in your browser.
  3. Click Connect (top right) to enroll a user with Teller Connect.
  4. After connecting, you’ll see accounts. Use the buttons to fetch Details, Balances, Transactions, and (for checking) manage Payees and Payments.
  5. The bottom bar shows the enrolled User ID and the Access Token used for API calls.
Sandbox Credentials
Use username username and password password to enroll a sandbox account.
See the Sandbox Guide: https://teller.io/docs/guides/sandbox for additional test credentials and flows (OTP, knowledge-based MFA, etc.).
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
26 stars
Watchers
4 watching
Forks
11 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Teller Examples
This project contains a simple front-end and multiple back-end implementations
for enrolling bank accounts and experimenting with the Teller API
Quick Start
Run the Python back-end (default):
make APP_ID=app_xxx
Visit http://localhost:8001.
Other Languages
If you want to try a different back-end, specify the language:
make run node APP_ID=app_xxx
make run ruby APP_ID=app_xxx
make run go APP_ID=app_xxx
make run elixir APP_ID=app_xxx
make run php APP_ID=app_xxx
make run dotnet APP_ID=app_xxx
make run java APP_ID=app_xxx
Each implementation lives under $REPO_ROOT/<language_name>/ with a run.sh.
Requirements
The only system-level requirements are:
  • macOS: Homebrew must be installed
  • Linux: apt must be available (Debian/Ubuntu based distributions)
The run.sh scripts will use Homebrew on macOS and apt on Linux to install any
missing runtimes automatically on first run.
Environment
  • APP_ID (required) — your Teller application ID
  • ENV (optional, default: sandbox) — set to development or production for live data
  • CERT and CERT_KEY - your Teller Application certificate and private key (required only when ENV is development or production)
Example (Java with mTLS in development):
make run java APP_ID=app_xxx ENV=development CERT=/path/to/cert.pem CERT_KEY=/path/to/key.pem
Usage
  1. Start a back-end with make run … as shown above.
  2. Open http://localhost:8001 in your browser.
  3. Click Connect (top right) to enroll a user with Teller Connect.
  4. After connecting, you’ll see accounts. Use the buttons to fetch Details, Balances, Transactions, and (for checking) manage Payees and Payments.
  5. The bottom bar shows the enrolled User ID and the Access Token used for API calls.
Sandbox Credentials
Use username username and password password to enroll a sandbox account.
See the Sandbox Guide: https://teller.io/docs/guides/sandbox for additional test credentials and flows (OTP, knowledge-based MFA, etc.).
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
26 stars
Watchers
4 watching
Forks
11 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Teller Examples
This project contains a simple front-end and multiple back-end implementations
for enrolling bank accounts and experimenting with the Teller API
Quick Start
Run the Python back-end (default):
make APP_ID=app_xxx
Visit http://localhost:8001.
Other Languages
If you want to try a different back-end, specify the language:
make run node APP_ID=app_xxx
make run ruby APP_ID=app_xxx
make run go APP_ID=app_xxx
make run elixir APP_ID=app_xxx
make run php APP_ID=app_xxx
make run dotnet APP_ID=app_xxx
make run java APP_ID=app_xxx
Each implementation lives under $REPO_ROOT/<language_name>/ with a run.sh.
Requirements
The only system-level requirements are:
  • macOS: Homebrew must be installed
  • Linux: apt must be available (Debian/Ubuntu based distributions)
The run.sh scripts will use Homebrew on macOS and apt on Linux to install any
missing runtimes automatically on first run.
Environment
  • APP_ID (required) — your Teller application ID
  • ENV (optional, default: sandbox) — set to development or production for live data
  • CERT and CERT_KEY - your Teller Application certificate and private key (required only when ENV is development or production)
Example (Java with mTLS in development):
make run java APP_ID=app_xxx ENV=development CERT=/path/to/cert.pem CERT_KEY=/path/to/key.pem
Usage
  1. Start a back-end with make run … as shown above.
  2. Open http://localhost:8001 in your browser.
  3. Click Connect (top right) to enroll a user with Teller Connect.
  4. After connecting, you’ll see accounts. Use the buttons to fetch Details, Balances, Transactions, and (for checking) manage Payees and Payments.
  5. The bottom bar shows the enrolled User ID and the Access Token used for API calls.
Sandbox Credentials
Use username username and password password to enroll a sandbox account.
See the Sandbox Guide: https://teller.io/docs/guides/sandbox for additional test credentials and flows (OTP, knowledge-based MFA, etc.).
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