# MD for: https://www.mercadopago.com.ar/developers/pt/docs/qr-code/pre-requisites/glossary.md

\# Glossary We know some concepts may be new for you. Before starting, here's a cheatsheet. | Term | Description | | --- | --- | | Credentials | Your credentials are the keys we give you so you can set up your integrations. To find them, go to your \[credentials\](https://www.mercadopago.com.ar/developers/es/docs/qr-code/additional-content/your-integrations/credentials) and select the productive ones. | | \`ACCESS\_TOKEN\` | The private app key to generate payments. You'll find it on the \[credentials\](https://www.mercadopago.com.ar/developers/en/docs/qr-code/additional-content/your-integrations/credentials) section. You must use it to identify yourself in your integrations. Always use the Production Mode credentials. | | \`USER\_ID\` | Buyer's user ID in Mercado Pago. You'll find it on the \[your application details\](https://www.mercadopago.com.ar/developers/en/docs/qr-code/additional-content/your-integrations/application-details). It's also known as the \`COLLECTOR\_ID\`. | | \`SPONSOR\_ID\` | Supplier's ID on the integrated system with Mercado Pago. Consist of the last digits of the \`access\_token\`, after the last dash. So, for instance, if your \`access\_token\` is \*\*APP\_USR-8499883828799661-062409-bf057c51fc05f87eba5608328f869879-776566693\*\*, then your \`USER\_ID\` is \*\*776566693\*\*. \`sponsor\_ID\` must be different than \`USER\_ID\`. | | Store | A \*\*physical shop\*\* in which your clients can get products and services. You can have multiple stores on one account. | | Point of sale (POS) | A \*\*place to perform a transaction\*\* on a store or physical shop. Each POS will be linked with a unique QR code. | | Order | A purchase made by your client. Contains a list of products with an associated cost. |