djkato/saleor-apps-redis_apl
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saleor-apps-redis_apl/apps/emails-and-messages/docs/architecture.md

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Data sequences

SMTP

sequenceDiagram
    Saleor API ->>+ EAM App: Order created
    EAM App ->>+ EAM App: Choose configuration based on event channel
    EAM App ->> EAM App: Use Handlebars to generate MJML template based on event payload
    EAM App ->>- EAM App: Convert MJML to HTML
    EAM App ->> SMTP Server: Send email
    SMTP Server ->> Customer: Send email
    EAM App ->>- Saleor API: Email has been send

Sendgrid

sequenceDiagram
    Saleor API ->>+ EAM App: Order created
    EAM App ->>+ EAM App: Choose configuration based on event channel
    EAM App ->> Sendgrid API: Send template ID and event payload
    Sendgrid API ->> Sendgrid API: Generate email
    Sendgrid API ->> Customer:  Send email
    EAM App ->>- Saleor API: Email has been send