§ Peptide-payments glossary

What is a MID?

A MID (Merchant Identification Number) is the unique account number issued by an acquiring bank that authorizes a merchant to accept Visa, Mastercard, Discover, and American Express card payments. Each MID has its own underwriting file, risk profile, and chargeback ratio history. Losing a MID means losing the ability to process card payments at that acquirer.

One merchant, multiple MIDs

A single peptide brand can hold more than one MID at different acquiring banks. If one MID is suspended, card acceptance at that bank stops until another account is approved. PeptideApprove does not promise a second account unless that pathway is in the written program terms.

What can terminate a MID

  • Excessive chargebacks (above Mastercard's published thresholds — see chargeback-ratio glossary)
  • BRAM violations (selling outside your declared MCC, missing LegitScript certification, FDA warning letter without remediation)
  • Sudden volume changes (3–5× spikes flag automated risk review)
  • Compliance review failures (LegitScript revocation, NACHA audit findings, etc.)

Why a clear underwriting file matters

When a MID terminates, applying for a new account can start from zero and may create downtime. The practical lesson for peptide merchants is to choose a program with clear underwriting, strong compliance review, and payout options planned before trouble starts.

How PeptideApprove issues MIDs

PeptideApprove focuses on getting compliant merchants through a clearer sponsor-bank review process with pricing confirmed in writing after underwriting. If additional payment pathways are appropriate, they are handled through written program terms.

Apply for a 48-hour underwriting response.

Merchant-services support for compliant peptide merchants. Pricing is confirmed in writing after underwriting. Approval is subject to KYC/KYB and partner review.

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