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Your test account, what to ask PayMe, and the rules

• Get Your Dedicated Test Account: Every integration starts with a dedicated test account. A seller opens one from the dashboard (Switch to test account, then Create test account) or signs up at paid.co.il. A partner writes to partners@payme.io for a sandbox partner key, partner secret and a connected terminal. PayMe publishes no shared test credentials.
• What to Ask PayMe First: Before building, ask PayMe (partners@payme.io) whether a terminal is connected to the sandbox account, to set the Default Callback URL per environment, whether Hosted Fields sellers need 3D Secure, whether subscriptions are enabled, what seller_plan values apply, how partial capture behaves, and whether white-label onboarding can be enabled.
• Rules for Agents: Numbered rules with stable IDs for PayMe integrations. SEC secrets stay on the server. MON money is integer minor units. TRN success is status_code 0 in a 2xx response, and money calls with unknown outcomes are not retried. CB callback bodies are never trusted and are confirmed by query. TOK tokens are encrypted bearer credentials. WRK look up fields, sandbox first, claim only what was run.