Can I submit the same lot number twice?
No. A lot number may be submitted once, and a repeat is refused with an error that names the earlier sample and its order, because two certificates describing one physical batch, with nothing recording which is authoritative, is how a verification surface ends up contradicting itself. A deliberate re-test is supported and declared instead: say that the new submission supersedes the earlier sample and why (panel upgrade, retest, stability timepoint, second opinion), and the new certificate supersedes the old one on release. And testing several vials from one lot is neither of those: submit once with all the vials.
How do I declare a blend or multi-component product?
Send the structure, not the sentence. Free-text label claims are capped at 200 characters because that field prints on the certificate, and a full per-component blend declaration overflows it immediately (a plain-English eight-component claim runs three times the cap). The per-component detail belongs in the structured components list, where each component carries its own declared mass and the blend's ratio becomes verifiable against the total. A short total in the label claim ("216 mg per 10 mL vial") plus the structured component list is the shape we can actually certify against.
What happens if the compound name I send does not match your catalog?
We refuse it and hand you the closest catalog candidates, rather than guessing, because a confident best-effort match is how a certificate ends up attesting the wrong molecule. Resolution is exact at every step: your canonical id, then your own saved alias map, then an exact catalog name or synonym, with punctuation and spacing folded so "5 Amino 1MQ" matches "5-Amino-1MQ". If you are unsure, ask the resolve endpoint (GET /api/v1/compounds/resolve?q=...) what we will map a name to: it runs the same resolver the submission runs, against your own alias map, so a dry run there cannot disagree with the real submission.
Can I build up one order as my vials arrive over several days?
Yes, that is what consignments are for. Repeat the same order reference across submissions and the samples land on one open order: one invoice and one shipment at the end instead of a new order per vial. Nothing on an open consignment is invoiced or benched until you close it, so a package built over a week is billed and received as the single physical shipment it actually is.