Developer with experience in Electronic Billing (DGII) (Dominican Republic) – Integration API Development *Project Description* We are looking for a *developer with proven experience in electronic billing in the Dominican Republic* to develop an *integration API with the DGII (e-CF)* that will connect our ERP/POS system to the test environment and subsequently to production. The candidate *must have previously implemented integrations with the DGII* and be familiar with the complete process of authentication, digital signature, and electronic invoice submission. *Scope of Work* The API must include: 1. *Authentication with DGII* * Obtain seed phrase * Sign seed phrase with digital certificate (.PFX / .P12) * Authenticate and obtain token 2. *Generation and Signing of e-CF* * Generate XML of the electronic invoice * Digitally sign XML *XAdES-BES with digital certificate* 3. *Submission to DGII* * Send e-CF to the receiving endpoint * Handle response and obtain *TrackID* 4. *Status Inquiry* * Endpoint to check the invoice status using *TrackID* 5. *REST API for our system* * Endpoint to issue invoices * Endpoint to check status * Handling DGII errors *Developer Requirements* * Proven experience with *DGII Electronic Invoicing (e-CF)* * Experience working with *XML, Digital Signatures, and .PFX Certificates* * Knowledge of the *DGII Seed Authentication Process* * Experience working with API integrations or ERP/POS systems * Preferably prior experience certifying systems with the DGII *Technical Information* DGII Endpoints to be integrated: * /authentication/api/Seed * /authentication/api/Authenticate * /reception/api/ElectronicInvoices * /checkResults/api/Inquiries/Status Initial Environment: *Sandbox / Pre-Certification* *Deliverables* * Functional DGII integration API * Endpoint documentation * Use cases * Source code