Laravel Credit Cards Laravel Package

Product Decisions This Supports

• Checkout/form feature scoping — what "card validation" actually buys you. This package answers one narrow question: does this look like a plausible card number, and which brand is it? It does not authorize, tokenize, or reduce decline rates. That distinction should anchor the feature spec: it is an input-quality and UX guardrail, not a payments capability. Any ticket titled "add card validation" should be re-read as "reduce avoidable gateway round-trips and reject typos before submission."

• Build vs. buy — and here, "buy" is really "borrow." The value delivered is a Luhn checksum (~20 lines), brand/BIN pattern matching (~30–60 lines of regex tables), and expiry/CVV length rules. That is a small, well-understood, deterministic algorithm — not a moat. The decision is therefore not "integrate a vendor" but "adopt a maintained table of BIN ranges instead of hand-maintaining one." Frame the buy case around table maintenance, because that is the only thing you are truly outsourcing.

• Roadmap sequencing: validation is a precondition, not a milestone. Treat this as a half-day enabler that unblocks the checkout work, not a roadmap line item. If it appears on a quarterly plan as a feature, the plan is wrong. Correct sequencing: adopt validation → instrument decline reasons → then invest in tokenization/gateway integration where the real conversion lift lives.

• Use cases worth funding: (1) client-side/server-side form validation on add-payment-method and one-off checkout flows; (2) brand detection to drive UI behavior — card logo rendering, CVV field length (3 vs 4 for Amex), field formatting; (3) pre-flight rejection to cut pointless gateway calls and their per-transaction cost; (4) reducing support tickets caused by "my card number is correct" typos.

• Use cases to explicitly de-scope: storing PANs, transmitting card data to non-tokenizing endpoints, using brand detection for fraud/routing decisions, or treating a Luhn pass as any signal of card validity. This package holds no state and stores nothing — keep it that way, because that is what keeps it out of PCI DSS scope.

• Diligence flag to resolve before commit: the repository is jlorente/laravel-credit-cards but the documented install target is inacho/php-credit-cards. Confirm which artifact ships the Laravel validation rules and which one you are actually pinning. A packaging ambiguity in a card-handling dependency is a legitimate reason to pause a half-day task.

• Adoption signal should be discounted appropriately. 7 stars, a 0.425 score, and a last release of September 2023 describe a single-maintainer utility with no community gravity. That is acceptable for a 50-line algorithm and unacceptable for anything on the critical path with no fallback. The mitigating factor — and the thing that makes this decision easy — is that the entire capability is vendor-able in an afternoon against your own fixture set. Low bus factor, low switching cost: asymmetric in your favor.

When to Consider This Package

Consider it when all of the following hold:

• You are on Laravel ≥5.6 (realistically 9/10/11) and want card rules to live in form requests / custom validation rules rather than sprinkled through controllers.
• Your card-validation needs are format-only: Luhn, brand detection, CVV length, expiry sanity. No BIN lookup API, no issuer metadata, no 3-D Secure orchestration.
• You already have (or are concurrently selecting) a payment gateway that tokenizes — Stripe, Adyen, Braintree, etc. This package sits strictly upstream of that call.
• You want the algorithm maintained by someone else and are comfortable pinning it and reviewing upstream bumps yourself.
• You have, or will write, a fixture suite of known test PANs to contract-test the behavior. Without that, you cannot detect the failure mode that matters.

Look elsewhere — or build the ~50 lines yourself — when:

• You need payment authorization, tokenization, 3-D Secure, or stored payment methods. This is the wrong category of tool entirely; evaluate gateway SDKs.
• You need real BIN/issuer intelligence (issuer country, card level, commercial vs. consumer, funding type). That requires a maintained BIN database or a lookup service — a data product, not a regex table.
• Your risk posture forbids single-maintainer dependencies in the payment path and you cannot accept the vendor-and-fork fallback. In that case, write the Luhn check in-house and keep the brand table as a code-reviewed constant.
• You need active maintenance SLAs or security response commitments. Seven stars and a one-line 2023 release note do not provide them.
• The packaging ambiguity (jlorente vs. inacho) cannot be resolved cleanly in your dependency tree, or your lockfile resolves to an unpinned upstream range.

The honest summary: this is a commodity utility with a thin Laravel wrapper. The bar for adopting it is "is it cheaper than writing 50 lines and owning a BIN table?" — usually yes, marginally. The bar for depending on it is much higher, and it does not clear that bar for anything beyond form validation.

How to Pitch It (Stakeholders)

To executives — one paragraph: "We're adding a small, free, open-source validation library to the checkout form. It checks that a card number is well-formed and identifies the card brand so we can show the right logo and CVV field. It does not process payments, does not touch money movement, and does not store any card data — so it doesn't expand our PCI compliance scope. Cost is effectively zero and it's a half-day of engineering. The benefit is fewer failed payment attempts caused by typos and a cleaner checkout experience. Risk is low because the underlying logic is simple and we can replace it with in-house code in an afternoon if the maintainer walks away."

To engineering — the framing that matters:

• Scope boundary is the whole story. This is request-time input validation only: Luhn checksum, brand/BIN pattern matching, CVV and expiry sanity. No I/O, no network calls, no state, sub-millisecond CPU cost. Confirm there is no phone-home BIN lookup before merge — that would change the risk profile entirely.
• Wrap it, don't scatter it. One CardValidator service, one ValidCardNumber custom rule, normalization (strip spaces/hyphens) at the boundary, and a central brand-name mapping to whatever strings our gateway expects (master vs mastercard, amex vs american_express). All extension points live in our code, not in vendor code.
• Contract tests are the deliverable, not the integration. A fixture file of known-valid PANs, unsupported-brand-but-Luhn-valid numbers, boundary lengths, and formatted inputs. That suite is what makes the dependency safe to update — and what makes forking cheap.
• Never log the PAN. Log a reason code (Luhn failure / unrecognized brand / bad expiry) and last-four-plus-brand only. Instrument the reason code, or every false rejection becomes an unreproducible support ticket.
• Do not bundle this with a checkout-flow change. Land the integration with green contract tests, then let the flow change ride a separate release so validation-only regressions are distinguishable from flow regressions.

The one risk to name out loud: the dominant failure mode is a silent false negative — a stale or over-strict brand table rejecting a legitimate, newly-issued card. The user sees a generic failure and abandons; we see nothing. Mitigate with decline-rate monitoring segmented by brand and issuer, plus a twice-yearly review of the brand table against our actual issuer mix. Everything else about this package is boring, which is exactly what you want from a validator in the payment path.