Security: GetPayin-Tech/paylink-java

Security

SECURITY.md

Security Policy

Reporting a vulnerability

Do not open a public issue for a security problem.

Report it privately via GitHub's private vulnerability reporting, or email tech@getpayin.com.

Please include the SDK version, your Java version, a description of the impact, and a reproduction if you have one. We aim to acknowledge within 3 business days.

Supported versions

The latest minor release receives security fixes. Because the SDK is pre-1.0, patches are published against the newest version only.

Handling credentials

This SDK is server-side only.

  • hashToken is a signing secret. It must never reach a browser, mobile, or desktop client. Anyone holding it can forge requests and webhooks for your integration.
  • publicToken identifies the integration and is sent on every request. It is not secret, but it is not a substitute for the signing secret either.
  • Load both from environment variables, paylink.* properties, or a secret manager. Never commit them.

PaylinkClient.toString() does not include the hashToken, so it stays out of logs and traces that render the client.

Things this SDK does not do for you

  • Webhook replay protection. PayLink webhook signatures carry no timestamp or nonce, so a valid payload stays valid forever. Signature verification proves authenticity, not freshness. Pair webhooks().verify() with your own idempotency keyed on invoice_id.
  • PCI scope reduction.vcc().charge and cards().tokenize accept raw PAN and CVV. Sending real card data through your server puts that server in PCI scope. Prefer the hosted checkout (invoices().create) or card tokens where possible.
  • Error redaction.PaylinkApiException.raw() holds the API's response body verbatim so failures stay debuggable. If you forward errors to a third-party log or APM, review what that body can contain for your integration.

There aren't any published security advisories

, '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
Security: GetPayin-Tech/paylink-java
Security

SECURITY.md

Security Policy
Reporting a vulnerability
Do not open a public issue for a security problem.
Report it privately via GitHub's private vulnerability reporting, or email tech@getpayin.com.
Please include the SDK version, your Java version, a description of the impact, and a reproduction if you have one. We aim to acknowledge within 3 business days.
Supported versions
The latest minor release receives security fixes. Because the SDK is pre-1.0, patches are published against the newest version only.
Handling credentials
This SDK is server-side only.
  • hashToken is a signing secret. It must never reach a browser, mobile, or desktop client. Anyone holding it can forge requests and webhooks for your integration.
  • publicToken identifies the integration and is sent on every request. It is not secret, but it is not a substitute for the signing secret either.
  • Load both from environment variables, paylink.* properties, or a secret manager. Never commit them.
PaylinkClient.toString() does not include the hashToken, so it stays out of logs and traces that render the client.
Things this SDK does not do for you
  • Webhook replay protection. PayLink webhook signatures carry no timestamp or nonce, so a valid payload stays valid forever. Signature verification proves authenticity, not freshness. Pair webhooks().verify() with your own idempotency keyed on invoice_id.
  • PCI scope reduction.vcc().charge and cards().tokenize accept raw PAN and CVV. Sending real card data through your server puts that server in PCI scope. Prefer the hosted checkout (invoices().create) or card tokens where possible.
  • Error redaction.PaylinkApiException.raw() holds the API's response body verbatim so failures stay debuggable. If you forward errors to a third-party log or APM, review what that body can contain for your integration.
 There aren't any published security advisories


, '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
Security: GetPayin-Tech/paylink-java
Security

SECURITY.md

Security Policy
Reporting a vulnerability
Do not open a public issue for a security problem.
Report it privately via GitHub's private vulnerability reporting, or email tech@getpayin.com.
Please include the SDK version, your Java version, a description of the impact, and a reproduction if you have one. We aim to acknowledge within 3 business days.
Supported versions
The latest minor release receives security fixes. Because the SDK is pre-1.0, patches are published against the newest version only.
Handling credentials
This SDK is server-side only.
  • hashToken is a signing secret. It must never reach a browser, mobile, or desktop client. Anyone holding it can forge requests and webhooks for your integration.
  • publicToken identifies the integration and is sent on every request. It is not secret, but it is not a substitute for the signing secret either.
  • Load both from environment variables, paylink.* properties, or a secret manager. Never commit them.
PaylinkClient.toString() does not include the hashToken, so it stays out of logs and traces that render the client.
Things this SDK does not do for you
  • Webhook replay protection. PayLink webhook signatures carry no timestamp or nonce, so a valid payload stays valid forever. Signature verification proves authenticity, not freshness. Pair webhooks().verify() with your own idempotency keyed on invoice_id.
  • PCI scope reduction.vcc().charge and cards().tokenize accept raw PAN and CVV. Sending real card data through your server puts that server in PCI scope. Prefer the hosted checkout (invoices().create) or card tokens where possible.
  • Error redaction.PaylinkApiException.raw() holds the API's response body verbatim so failures stay debuggable. If you forward errors to a third-party log or APM, review what that body can contain for your integration.
 There aren't any published security advisories


, '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
Security: GetPayin-Tech/paylink-java
Security

SECURITY.md

Security Policy
Reporting a vulnerability
Do not open a public issue for a security problem.
Report it privately via GitHub's private vulnerability reporting, or email tech@getpayin.com.
Please include the SDK version, your Java version, a description of the impact, and a reproduction if you have one. We aim to acknowledge within 3 business days.
Supported versions
The latest minor release receives security fixes. Because the SDK is pre-1.0, patches are published against the newest version only.
Handling credentials
This SDK is server-side only.
  • hashToken is a signing secret. It must never reach a browser, mobile, or desktop client. Anyone holding it can forge requests and webhooks for your integration.
  • publicToken identifies the integration and is sent on every request. It is not secret, but it is not a substitute for the signing secret either.
  • Load both from environment variables, paylink.* properties, or a secret manager. Never commit them.
PaylinkClient.toString() does not include the hashToken, so it stays out of logs and traces that render the client.
Things this SDK does not do for you
  • Webhook replay protection. PayLink webhook signatures carry no timestamp or nonce, so a valid payload stays valid forever. Signature verification proves authenticity, not freshness. Pair webhooks().verify() with your own idempotency keyed on invoice_id.
  • PCI scope reduction.vcc().charge and cards().tokenize accept raw PAN and CVV. Sending real card data through your server puts that server in PCI scope. Prefer the hosted checkout (invoices().create) or card tokens where possible.
  • Error redaction.PaylinkApiException.raw() holds the API's response body verbatim so failures stay debuggable. If you forward errors to a third-party log or APM, review what that body can contain for your integration.
 There aren't any published security advisories


, '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
Security: GetPayin-Tech/paylink-java
Security

SECURITY.md

Security Policy
Reporting a vulnerability
Do not open a public issue for a security problem.
Report it privately via GitHub's private vulnerability reporting, or email tech@getpayin.com.
Please include the SDK version, your Java version, a description of the impact, and a reproduction if you have one. We aim to acknowledge within 3 business days.
Supported versions
The latest minor release receives security fixes. Because the SDK is pre-1.0, patches are published against the newest version only.
Handling credentials
This SDK is server-side only.
  • hashToken is a signing secret. It must never reach a browser, mobile, or desktop client. Anyone holding it can forge requests and webhooks for your integration.
  • publicToken identifies the integration and is sent on every request. It is not secret, but it is not a substitute for the signing secret either.
  • Load both from environment variables, paylink.* properties, or a secret manager. Never commit them.
PaylinkClient.toString() does not include the hashToken, so it stays out of logs and traces that render the client.
Things this SDK does not do for you
  • Webhook replay protection. PayLink webhook signatures carry no timestamp or nonce, so a valid payload stays valid forever. Signature verification proves authenticity, not freshness. Pair webhooks().verify() with your own idempotency keyed on invoice_id.
  • PCI scope reduction.vcc().charge and cards().tokenize accept raw PAN and CVV. Sending real card data through your server puts that server in PCI scope. Prefer the hosted checkout (invoices().create) or card tokens where possible.
  • Error redaction.PaylinkApiException.raw() holds the API's response body verbatim so failures stay debuggable. If you forward errors to a third-party log or APM, review what that body can contain for your integration.
 There aren't any published security advisories


, '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
Security: GetPayin-Tech/paylink-java
Security

SECURITY.md

Security Policy
Reporting a vulnerability
Do not open a public issue for a security problem.
Report it privately via GitHub's private vulnerability reporting, or email tech@getpayin.com.
Please include the SDK version, your Java version, a description of the impact, and a reproduction if you have one. We aim to acknowledge within 3 business days.
Supported versions
The latest minor release receives security fixes. Because the SDK is pre-1.0, patches are published against the newest version only.
Handling credentials
This SDK is server-side only.
  • hashToken is a signing secret. It must never reach a browser, mobile, or desktop client. Anyone holding it can forge requests and webhooks for your integration.
  • publicToken identifies the integration and is sent on every request. It is not secret, but it is not a substitute for the signing secret either.
  • Load both from environment variables, paylink.* properties, or a secret manager. Never commit them.
PaylinkClient.toString() does not include the hashToken, so it stays out of logs and traces that render the client.
Things this SDK does not do for you
  • Webhook replay protection. PayLink webhook signatures carry no timestamp or nonce, so a valid payload stays valid forever. Signature verification proves authenticity, not freshness. Pair webhooks().verify() with your own idempotency keyed on invoice_id.
  • PCI scope reduction.vcc().charge and cards().tokenize accept raw PAN and CVV. Sending real card data through your server puts that server in PCI scope. Prefer the hosted checkout (invoices().create) or card tokens where possible.
  • Error redaction.PaylinkApiException.raw() holds the API's response body verbatim so failures stay debuggable. If you forward errors to a third-party log or APM, review what that body can contain for your integration.
 There aren't any published security advisories


, '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
Security: GetPayin-Tech/paylink-java
Security

SECURITY.md

Security Policy
Reporting a vulnerability
Do not open a public issue for a security problem.
Report it privately via GitHub's private vulnerability reporting, or email tech@getpayin.com.
Please include the SDK version, your Java version, a description of the impact, and a reproduction if you have one. We aim to acknowledge within 3 business days.
Supported versions
The latest minor release receives security fixes. Because the SDK is pre-1.0, patches are published against the newest version only.
Handling credentials
This SDK is server-side only.
  • hashToken is a signing secret. It must never reach a browser, mobile, or desktop client. Anyone holding it can forge requests and webhooks for your integration.
  • publicToken identifies the integration and is sent on every request. It is not secret, but it is not a substitute for the signing secret either.
  • Load both from environment variables, paylink.* properties, or a secret manager. Never commit them.
PaylinkClient.toString() does not include the hashToken, so it stays out of logs and traces that render the client.
Things this SDK does not do for you
  • Webhook replay protection. PayLink webhook signatures carry no timestamp or nonce, so a valid payload stays valid forever. Signature verification proves authenticity, not freshness. Pair webhooks().verify() with your own idempotency keyed on invoice_id.
  • PCI scope reduction.vcc().charge and cards().tokenize accept raw PAN and CVV. Sending real card data through your server puts that server in PCI scope. Prefer the hosted checkout (invoices().create) or card tokens where possible.
  • Error redaction.PaylinkApiException.raw() holds the API's response body verbatim so failures stay debuggable. If you forward errors to a third-party log or APM, review what that body can contain for your integration.
 There aren't any published security advisories


, '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); }
})();
})();

Skip to content
Security: GetPayin-Tech/paylink-java
Security

SECURITY.md

Security Policy
Reporting a vulnerability
Do not open a public issue for a security problem.
Report it privately via GitHub's private vulnerability reporting, or email tech@getpayin.com.
Please include the SDK version, your Java version, a description of the impact, and a reproduction if you have one. We aim to acknowledge within 3 business days.
Supported versions
The latest minor release receives security fixes. Because the SDK is pre-1.0, patches are published against the newest version only.
Handling credentials
This SDK is server-side only.
  • hashToken is a signing secret. It must never reach a browser, mobile, or desktop client. Anyone holding it can forge requests and webhooks for your integration.
  • publicToken identifies the integration and is sent on every request. It is not secret, but it is not a substitute for the signing secret either.
  • Load both from environment variables, paylink.* properties, or a secret manager. Never commit them.
PaylinkClient.toString() does not include the hashToken, so it stays out of logs and traces that render the client.
Things this SDK does not do for you
  • Webhook replay protection. PayLink webhook signatures carry no timestamp or nonce, so a valid payload stays valid forever. Signature verification proves authenticity, not freshness. Pair webhooks().verify() with your own idempotency keyed on invoice_id.
  • PCI scope reduction.vcc().charge and cards().tokenize accept raw PAN and CVV. Sending real card data through your server puts that server in PCI scope. Prefer the hosted checkout (invoices().create) or card tokens where possible.
  • Error redaction.PaylinkApiException.raw() holds the API's response body verbatim so failures stay debuggable. If you forward errors to a third-party log or APM, review what that body can contain for your integration.
 There aren't any published security advisories