diff --git a/app/Libraries/Abdm/Fhir/FhirDocumentBuilder.php b/app/Libraries/Abdm/Fhir/FhirDocumentBuilder.php
index ee1e268..7520b2d 100644
--- a/app/Libraries/Abdm/Fhir/FhirDocumentBuilder.php
+++ b/app/Libraries/Abdm/Fhir/FhirDocumentBuilder.php
@@ -161,6 +161,12 @@ class FhirDocumentBuilder
         return $this->addResource($resource);
     }
 
+    /** @param array<string,mixed> $resource */
+    public function addImmunization(array $resource): self
+    {
+        return $this->addResource($resource);
+    }
+
     /**
      * @return array<string,mixed>
      */
@@ -252,7 +258,7 @@ class FhirDocumentBuilder
     /**
      * @param array<string,mixed> $resource
      */
-    private function addResource(array $resource): self
+    public function addResource(array $resource): self
     {
         $id = (string) ($resource['id'] ?? '');
         if ($id === '') {
diff --git a/app/Libraries/Abdm/Fhir/FhirGeneratorFactory.php b/app/Libraries/Abdm/Fhir/FhirGeneratorFactory.php
index 2be70bc..3f16065 100644
--- a/app/Libraries/Abdm/Fhir/FhirGeneratorFactory.php
+++ b/app/Libraries/Abdm/Fhir/FhirGeneratorFactory.php
@@ -4,9 +4,11 @@ namespace App\Libraries\Abdm\Fhir;
 
 use App\Libraries\Abdm\Fhir\Generators\DischargeFhirGenerator;
 use App\Libraries\Abdm\Fhir\Generators\HealthDocumentFhirGenerator;
+use App\Libraries\Abdm\Fhir\Generators\ImmunizationFhirGenerator;
 use App\Libraries\Abdm\Fhir\Generators\InvoiceFhirGenerator;
 use App\Libraries\Abdm\Fhir\Generators\LabFhirGenerator;
 use App\Libraries\Abdm\Fhir\Generators\OpdFhirGenerator;
+use App\Libraries\Abdm\Fhir\Generators\PrescriptionFhirGenerator;
 use App\Libraries\Abdm\Fhir\Generators\RadiologyFhirGenerator;
 use App\Libraries\Abdm\Fhir\Generators\WellnessFhirGenerator;
 
@@ -42,6 +44,16 @@ class FhirGeneratorFactory
         return new HealthDocumentFhirGenerator();
     }
 
+    public function prescription(): PrescriptionFhirGenerator
+    {
+        return new PrescriptionFhirGenerator();
+    }
+
+    public function immunization(): ImmunizationFhirGenerator
+    {
+        return new ImmunizationFhirGenerator();
+    }
+
     public function wellness(): WellnessFhirGenerator
     {
         return new WellnessFhirGenerator();
diff --git a/app/Libraries/Abdm/Fhir/Generators/ImmunizationFhirGenerator.php b/app/Libraries/Abdm/Fhir/Generators/ImmunizationFhirGenerator.php
new file mode 100644
index 0000000..37e97c9
--- /dev/null
+++ b/app/Libraries/Abdm/Fhir/Generators/ImmunizationFhirGenerator.php
@@ -0,0 +1,214 @@
+<?php
+
+namespace App\Libraries\Abdm\Fhir\Generators;
+
+class ImmunizationFhirGenerator extends AbstractModuleFhirGenerator
+{
+    /**
+     * @param array<string,mixed> $source
+     * @return array<string,mixed>
+     */
+    public function generate(array $source): array
+    {
+        $timestamp = (string) ($source['completed_at'] ?? date(DATE_ATOM));
+        $recordId = (string) ($source['record_id'] ?? '0');
+        $patientId = (string) ($source['patient']['id'] ?? '0');
+        $visitDate = (string) ($source['visit_date'] ?? date('Y-m-d'));
+
+        $careContextReference = 'IMMUNIZATION-' . $recordId . '-' . $visitDate;
+        $careContextDisplay = 'Immunization ' . $visitDate;
+
+        $builder = new \App\Libraries\Abdm\Fhir\FhirDocumentBuilder();
+        $builder
+            ->buildBundleMeta('immunization-' . $recordId . '-' . strtotime($timestamp), $timestamp)
+            ->addPatient($this->buildBasePatient($source));
+
+        $patientRef = 'urn:uuid:patient-' . $patientId;
+
+        $practitioner = $this->buildPractitioner($source);
+        if (! is_array($practitioner)) {
+            $fallbackDoctorName = trim((string) ($source['doctor_name'] ?? 'Dr. Attending Medical Officer'));
+            $docId = (string) ($source['practitioner']['id'] ?? $source['doctor']['id'] ?? '1');
+            $practitioner = [
+                'resourceType' => 'Practitioner',
+                'id' => 'practitioner-' . ($docId !== '' && $docId !== '0' ? $docId : '1'),
+                'name' => [[
+                    'text' => $fallbackDoctorName !== '' ? $fallbackDoctorName : 'Dr. Attending Medical Officer',
+                ]],
+            ];
+        }
+        $builder->addPractitioner($practitioner);
+
+        $organization = $this->buildOrganization($source);
+        if (! is_array($organization)) {
+            $orgId = (string) ($source['organization']['id'] ?? $source['hfr_id'] ?? 'IN0510000871');
+            $orgName = (string) ($source['organization']['name'] ?? 'Hospital');
+            $organization = [
+                'resourceType' => 'Organization',
+                'id' => 'organization-' . ($orgId !== '' ? $orgId : 'IN0510000871'),
+                'name' => $orgName,
+            ];
+        }
+        $builder->addOrganization($organization);
+
+        $immunizationRefs = [];
+        $resolvedCount = 0;
+        $unresolvedCount = 0;
+        $fallbackCount = 0;
+
+        foreach ((array) ($source['immunizations'] ?? $source['vaccines'] ?? []) as $idx => $imm) {
+            $vaccineName = trim((string) ($imm['vaccine_name'] ?? $imm['name'] ?? ''));
+            if (! $this->isMeaningfulValue($vaccineName)) {
+                continue;
+            }
+
+            $code = trim((string) ($imm['code'] ?? $imm['snomed_code'] ?? ''));
+            $coding = [];
+            if ($code !== '') {
+                $coding[] = [
+                    'system' => 'http://snomed.info/sct',
+                    'code' => $code,
+                    'display' => $vaccineName,
+                ];
+                $resolvedCount++;
+            } else {
+                $coding[] = [
+                    'system' => 'http://snomed.info/sct',
+                    'code' => '41000179103',
+                    'display' => $vaccineName,
+                ];
+                $fallbackCount++;
+            }
+
+            $immId = 'immunization-' . $recordId . '-' . $idx;
+            $immunizationRefs[] = [
+                'reference' => 'urn:uuid:' . $immId,
+                'type' => 'Immunization',
+            ];
+
+            $immResource = [
+                'resourceType' => 'Immunization',
+                'id' => $immId,
+                'meta' => ['profile' => ['https://nrces.in/ndhm/fhir/r4/StructureDefinition/Immunization']],
+                'status' => 'completed',
+                'vaccineCode' => [
+                    'coding' => $coding,
+                    'text' => $vaccineName,
+                ],
+                'patient' => ['reference' => $patientRef],
+                'occurrenceDateTime' => (string) ($imm['occurrence_date'] ?? $imm['given_date'] ?? $timestamp),
+                'primarySource' => true,
+            ];
+
+            $builder->addResource($immResource);
+        }
+
+        $sectionEntries = $immunizationRefs;
+
+        // Support certificate / scan document reference
+        $docData = (string) ($source['certificate_pdf_base64'] ?? $source['document_data_base64'] ?? $source['pdf_base64'] ?? '');
+        if ($docData !== '') {
+            $docRefId = 'immunization-doc-' . $recordId;
+            $builder->addDocumentReference([
+                'resourceType' => 'DocumentReference',
+                'id' => $docRefId,
+                'meta' => ['profile' => ['https://nrces.in/ndhm/fhir/r4/StructureDefinition/DocumentReference']],
+                'status' => 'current',
+                'docStatus' => 'final',
+                'type' => [
+                    'coding' => [[
+                        'system' => 'http://snomed.info/sct',
+                        'code' => '41000179103',
+                        'display' => 'Immunization record',
+                    ]],
+                    'text' => 'Immunization Certificate PDF',
+                ],
+                'subject' => ['reference' => $patientRef],
+                'date' => $timestamp,
+                'description' => 'Vaccination Certificate PDF',
+                'content' => [[
+                    'attachment' => [
+                        'contentType' => 'application/pdf',
+                        'language' => 'en-IN',
+                        'data' => $docData,
+                        'title' => 'Vaccine Certificate.pdf',
+                        'creation' => $timestamp,
+                    ],
+                ]],
+            ]);
+            $sectionEntries[] = [
+                'reference' => 'urn:uuid:' . $docRefId,
+                'type' => 'DocumentReference',
+            ];
+        }
+
+        $authorRef = 'urn:uuid:' . (string) $practitioner['id'];
+        $authorDisplay = (string) ($practitioner['name'][0]['text'] ?? 'Dr. Attending Medical Officer');
+        $custodianRef = 'urn:uuid:' . (string) $organization['id'];
+
+        $composition = [
+            'resourceType' => 'Composition',
+            'id' => 'composition-' . $recordId,
+            'meta' => [
+                'versionId' => '1',
+                'lastUpdated' => $timestamp,
+                'profile' => [
+                    'https://nrces.in/ndhm/fhir/r4/StructureDefinition/ImmunizationRecord',
+                ],
+            ],
+            'status' => 'final',
+            'type' => [
+                'coding' => [[
+                    'system' => 'http://snomed.info/sct',
+                    'code' => '41000179103',
+                    'display' => 'Immunization record',
+                ]],
+                'text' => 'Immunization record',
+            ],
+            'title' => 'Immunization record',
+            'date' => $timestamp,
+            'subject' => [
+                'reference' => $patientRef,
+                'display' => (string) ($source['patient']['name'] ?? 'Patient'),
+            ],
+            'author' => [[
+                'reference' => $authorRef,
+                'display' => $authorDisplay,
+            ]],
+            'custodian' => [
+                'reference' => $custodianRef,
+                'display' => (string) ($organization['name'] ?? 'Hospital'),
+            ],
+            'section' => [
+                [
+                    'title' => 'Immunization record',
+                    'code' => [
+                        'coding' => [[
+                            'system' => 'http://snomed.info/sct',
+                            'code' => '41000179103',
+                            'display' => 'Immunization record',
+                        ]],
+                    ],
+                    'entry' => $sectionEntries,
+                ],
+            ],
+        ];
+
+        $builder->buildComposition($composition);
+
+        $bundle = $builder->toBundle();
+        $validation = $this->validator->validate($bundle, 'immunization', [
+            'resolved' => $resolvedCount,
+            'unresolved' => $unresolvedCount,
+            'fallback_used' => $fallbackCount,
+        ]);
+
+        return [
+            'hi_type' => 'ImmunizationRecord',
+            'care_context_reference' => $careContextReference,
+            'care_context_display' => $careContextDisplay,
+            'fhir_bundle' => $bundle,
+            'validation' => $validation->toArray(),
+        ];
+    }
+}
diff --git a/app/Libraries/Abdm/Fhir/Generators/PrescriptionFhirGenerator.php b/app/Libraries/Abdm/Fhir/Generators/PrescriptionFhirGenerator.php
new file mode 100644
index 0000000..62807eb
--- /dev/null
+++ b/app/Libraries/Abdm/Fhir/Generators/PrescriptionFhirGenerator.php
@@ -0,0 +1,263 @@
+<?php
+
+namespace App\Libraries\Abdm\Fhir\Generators;
+
+class PrescriptionFhirGenerator extends AbstractModuleFhirGenerator
+{
+    /**
+     * @param array<string,mixed> $source
+     * @return array<string,mixed>
+     */
+    public function generate(array $source): array
+    {
+        $timestamp = (string) ($source['completed_at'] ?? date(DATE_ATOM));
+        $recordId = (string) ($source['record_id'] ?? '0');
+        $patientId = (string) ($source['patient']['id'] ?? '0');
+        $sessionId = (string) ($source['session_id'] ?? '0');
+        $visitDate = (string) ($source['visit_date'] ?? date('Y-m-d'));
+
+        $careContextReference = 'PRESCRIPTION-' . $recordId . ($sessionId !== '0' ? '-S' . $sessionId : '') . '-' . $visitDate;
+        $careContextDisplay = 'Prescription ' . $visitDate;
+
+        $builder = new \App\Libraries\Abdm\Fhir\FhirDocumentBuilder();
+        $builder
+            ->buildBundleMeta('prescription-' . $recordId . '-' . strtotime($timestamp), $timestamp)
+            ->addPatient($this->buildBasePatient($source));
+
+        $patientRef = 'urn:uuid:patient-' . $patientId;
+
+        $practitioner = $this->buildPractitioner($source);
+        if (! is_array($practitioner)) {
+            $fallbackDoctorName = trim((string) ($source['doctor_name'] ?? 'Dr. Attending Medical Officer'));
+            $docId = (string) ($source['practitioner']['id'] ?? $source['doctor']['id'] ?? '1');
+            $practitioner = [
+                'resourceType' => 'Practitioner',
+                'id' => 'practitioner-' . ($docId !== '' && $docId !== '0' ? $docId : '1'),
+                'name' => [[
+                    'text' => $fallbackDoctorName !== '' ? $fallbackDoctorName : 'Dr. Attending Medical Officer',
+                ]],
+            ];
+        }
+        $builder->addPractitioner($practitioner);
+
+        $organization = $this->buildOrganization($source);
+        if (! is_array($organization)) {
+            $orgId = (string) ($source['organization']['id'] ?? $source['hfr_id'] ?? 'IN0510000871');
+            $orgName = (string) ($source['organization']['name'] ?? 'Hospital');
+            $organization = [
+                'resourceType' => 'Organization',
+                'id' => 'organization-' . ($orgId !== '' ? $orgId : 'IN0510000871'),
+                'name' => $orgName,
+            ];
+        }
+        $builder->addOrganization($organization);
+
+        $encounter = $this->buildEncounter($source);
+        $encounterRef = null;
+        if (is_array($encounter)) {
+            $builder->addEncounter($encounter);
+            $encounterRef = 'urn:uuid:' . (string) $encounter['id'];
+        }
+
+        $medicationRefs = [];
+        $resolvedCount = 0;
+        $unresolvedCount = 0;
+        $fallbackCount = 0;
+
+        foreach ((array) ($source['medications'] ?? []) as $idx => $med) {
+            $drugName = trim((string) ($med['name'] ?? $med['drug_name'] ?? ''));
+            if (! $this->isMeaningfulValue($drugName)) {
+                continue;
+            }
+
+            $dosageText = trim((string) ($med['dosage'] ?? ''));
+            $medType = trim((string) ($med['formulation'] ?? $med['med_type'] ?? ''));
+            $routeText = trim((string) ($med['route_text'] ?? ''));
+            if (! $this->isMeaningfulValue($routeText)) {
+                $medTypeUpper = strtoupper($medType);
+                if (in_array($medTypeUpper, ['INJ', 'INJECTION', 'IV', 'IM'], true)) {
+                    $routeText = 'Injection';
+                    $routeCode = '47625008';
+                } elseif (in_array($medTypeUpper, ['CREAM', 'OINT', 'OINTMENT', 'GEL', 'LOTION'], true)) {
+                    $routeText = 'Topical';
+                    $routeCode = '6064005';
+                } else {
+                    $routeText = 'Oral';
+                    $routeCode = '260548002';
+                }
+            } else {
+                $routeCode = '260548002';
+            }
+
+            $dosageInstruction = [[
+                'text' => $dosageText,
+                'route' => [
+                    'coding' => [[
+                        'system' => 'http://snomed.info/sct',
+                        'code' => $routeCode,
+                        'display' => $routeText,
+                    ]],
+                    'text' => $routeText,
+                ],
+            ]];
+
+            $code = trim((string) ($med['code'] ?? $med['snomed_code'] ?? ''));
+            $coding = [];
+            if ($code !== '' && $code !== '371530004') {
+                $coding[] = [
+                    'system' => 'http://snomed.info/sct',
+                    'code' => $code,
+                    'display' => $drugName,
+                ];
+                $resolvedCount++;
+            } else {
+                $coding[] = [
+                    'system' => 'http://snomed.info/sct',
+                    'code' => '105904009',
+                    'display' => $drugName,
+                ];
+                $fallbackCount++;
+            }
+
+            $medId = 'medication-' . $recordId . '-' . $idx;
+            $medicationRefs[] = [
+                'reference' => 'urn:uuid:' . $medId,
+                'type' => 'MedicationRequest',
+            ];
+
+            $medResource = [
+                'resourceType' => 'MedicationRequest',
+                'id' => $medId,
+                'meta' => ['profile' => ['https://nrces.in/ndhm/fhir/r4/StructureDefinition/MedicationRequest']],
+                'status' => 'active',
+                'intent' => 'order',
+                'subject' => ['reference' => $patientRef],
+                'authoredOn' => $timestamp,
+                'requester' => ['reference' => 'urn:uuid:' . (string) $practitioner['id']],
+                'medicationCodeableConcept' => [
+                    'coding' => $coding,
+                    'text' => $drugName,
+                ],
+                'dosageInstruction' => $dosageInstruction,
+            ];
+
+            if ($encounterRef !== null) {
+                $medResource['encounter'] = ['reference' => $encounterRef];
+            }
+
+            $builder->addMedicationRequest($medResource);
+        }
+
+        $sectionEntries = $medicationRefs;
+
+        // Support attached scanned or digital prescription copy (Binary or DocumentReference)
+        $docData = (string) ($source['prescription_pdf_base64'] ?? $source['document_data_base64'] ?? $source['pdf_base64'] ?? '');
+        if ($docData !== '') {
+            $docRefId = 'prescription-doc-' . $recordId;
+            $builder->addDocumentReference([
+                'resourceType' => 'DocumentReference',
+                'id' => $docRefId,
+                'meta' => ['profile' => ['https://nrces.in/ndhm/fhir/r4/StructureDefinition/DocumentReference']],
+                'status' => 'current',
+                'docStatus' => 'final',
+                'type' => [
+                    'coding' => [[
+                        'system' => 'http://snomed.info/sct',
+                        'code' => '440545006',
+                        'display' => 'Prescription record',
+                    ]],
+                    'text' => 'Prescription PDF',
+                ],
+                'subject' => ['reference' => $patientRef],
+                'date' => $timestamp,
+                'description' => 'Prescription Copy PDF',
+                'content' => [[
+                    'attachment' => [
+                        'contentType' => 'application/pdf',
+                        'language' => 'en-IN',
+                        'data' => $docData,
+                        'title' => 'Prescription.pdf',
+                        'creation' => $timestamp,
+                    ],
+                ]],
+            ]);
+            $sectionEntries[] = [
+                'reference' => 'urn:uuid:' . $docRefId,
+                'type' => 'DocumentReference',
+            ];
+        }
+
+        $authorRef = 'urn:uuid:' . (string) $practitioner['id'];
+        $authorDisplay = (string) ($practitioner['name'][0]['text'] ?? 'Dr. Attending Medical Officer');
+        $custodianRef = 'urn:uuid:' . (string) $organization['id'];
+
+        $composition = [
+            'resourceType' => 'Composition',
+            'id' => 'composition-' . $recordId,
+            'meta' => [
+                'versionId' => '1',
+                'lastUpdated' => $timestamp,
+                'profile' => [
+                    'https://nrces.in/ndhm/fhir/r4/StructureDefinition/PrescriptionRecord',
+                ],
+            ],
+            'status' => 'final',
+            'type' => [
+                'coding' => [[
+                    'system' => 'http://snomed.info/sct',
+                    'code' => '440545006',
+                    'display' => 'Prescription record',
+                ]],
+                'text' => 'Prescription record',
+            ],
+            'title' => 'Prescription record',
+            'date' => $timestamp,
+            'subject' => [
+                'reference' => $patientRef,
+                'display' => (string) ($source['patient']['name'] ?? 'Patient'),
+            ],
+            'author' => [[
+                'reference' => $authorRef,
+                'display' => $authorDisplay,
+            ]],
+            'custodian' => [
+                'reference' => $custodianRef,
+                'display' => (string) ($organization['name'] ?? 'Hospital'),
+            ],
+            'section' => [
+                [
+                    'title' => 'Prescription record',
+                    'code' => [
+                        'coding' => [[
+                            'system' => 'http://snomed.info/sct',
+                            'code' => '440545006',
+                            'display' => 'Prescription record',
+                        ]],
+                    ],
+                    'entry' => $sectionEntries,
+                ],
+            ],
+        ];
+
+        if ($encounterRef !== null) {
+            $composition['encounter'] = ['reference' => $encounterRef];
+        }
+
+        $builder->buildComposition($composition);
+
+        $bundle = $builder->toBundle();
+        $validation = $this->validator->validate($bundle, 'prescription', [
+            'resolved' => $resolvedCount,
+            'unresolved' => $unresolvedCount,
+            'fallback_used' => $fallbackCount,
+        ]);
+
+        return [
+            'hi_type' => 'PrescriptionRecord',
+            'care_context_reference' => $careContextReference,
+            'care_context_display' => $careContextDisplay,
+            'fhir_bundle' => $bundle,
+            'validation' => $validation->toArray(),
+        ];
+    }
+}
diff --git a/tests/unit/Abdm/FhirGeneratorsTest.php b/tests/unit/Abdm/FhirGeneratorsTest.php
index 7129673..f8b611a 100644
--- a/tests/unit/Abdm/FhirGeneratorsTest.php
+++ b/tests/unit/Abdm/FhirGeneratorsTest.php
@@ -1122,6 +1122,140 @@ final class FhirGeneratorsTest extends CIUnitTestCase
         $encExp = array_values(array_filter($outExp['fhir_bundle']['entry'], static fn (array $e): bool => ($e['resource']['resourceType'] ?? '') === 'Encounter'))[0]['resource'];
         $this->assertSame('exp', $encExp['hospitalization']['dischargeDisposition']['coding'][0]['code']);
     }
+
+    public function testPrescriptionGeneratorHappyPath(): void
+    {
+        $src = [
+            'record_id' => 9001,
+            'session_id' => 1,
+            'visit_date' => '2026-06-27',
+            'completed_at' => '2026-06-27T10:00:00+05:30',
+            'patient' => [
+                'id' => 12,
+                'name' => 'Devender Singh',
+                'gender' => 'male',
+                'dob' => '1979-03-28',
+                'abha_id' => '1234-5678-9012',
+            ],
+            'encounter' => [
+                'id' => 'E101',
+                'start' => '2026-06-27T09:30:00+05:30',
+                'end' => '2026-06-27T10:00:00+05:30',
+            ],
+            'doctor' => [
+                'id' => 'D9',
+                'name' => 'Dr. R K Sundriyal',
+            ],
+            'organization' => [
+                'id' => 'H1',
+                'name' => 'Chamunda Hospital',
+            ],
+            'medications' => [
+                [
+                    'name' => 'Paracetamol 500mg',
+                    'code' => '387593006',
+                    'dosage' => '1 tablet twice daily for 3 days',
+                    'formulation' => 'TAB',
+                ],
+                [
+                    'name' => 'Amoxicillin 500mg',
+                    'code' => '372687004',
+                    'dosage' => '1 capsule thrice daily after meals',
+                    'formulation' => 'CAP',
+                ],
+            ],
+            'prescription_pdf_base64' => base64_encode('%PDF-1.4 test prescription'),
+        ];
+
+        $out = $this->factory->prescription()->generate($src);
+        $this->assertSame('PrescriptionRecord', $out['hi_type']);
+        $this->assertSame('PRESCRIPTION-9001-S1-2026-06-27', $out['care_context_reference']);
+        $this->assertTrue((bool) ($out['validation']['valid'] ?? false));
+
+        $bundle = $out['fhir_bundle'];
+        $this->assertSame('Bundle', $bundle['resourceType']);
+        $this->assertSame('document', $bundle['type']);
+
+        $composition = $bundle['entry'][0]['resource'];
+        $this->assertSame('Composition', $composition['resourceType']);
+        $this->assertContains('https://nrces.in/ndhm/fhir/r4/StructureDefinition/PrescriptionRecord', $composition['meta']['profile']);
+        $this->assertSame('440545006', $composition['type']['coding'][0]['code']);
+        $this->assertCount(1, $composition['section']);
+        $this->assertSame('440545006', $composition['section'][0]['code']['coding'][0]['code']);
+
+        // Check medication requests and document reference
+        $medRequests = array_values(array_filter($bundle['entry'], static fn (array $e): bool => ($e['resource']['resourceType'] ?? '') === 'MedicationRequest'));
+        $this->assertCount(2, $medRequests);
+        $this->assertSame('active', $medRequests[0]['resource']['status']);
+        $this->assertSame('order', $medRequests[0]['resource']['intent']);
+
+        $docRefs = array_values(array_filter($bundle['entry'], static fn (array $e): bool => ($e['resource']['resourceType'] ?? '') === 'DocumentReference'));
+        $this->assertCount(1, $docRefs);
+        $this->assertSame('application/pdf', $docRefs[0]['resource']['content'][0]['attachment']['contentType']);
+    }
+
+    public function testImmunizationGeneratorHappyPath(): void
+    {
+        $src = [
+            'record_id' => 9002,
+            'visit_date' => '2026-06-27',
+            'completed_at' => '2026-06-27T10:30:00+05:30',
+            'patient' => [
+                'id' => 12,
+                'name' => 'Devender Singh',
+                'gender' => 'male',
+                'dob' => '1979-03-28',
+                'abha_id' => '1234-5678-9012',
+            ],
+            'doctor' => [
+                'id' => 'D9',
+                'name' => 'Dr. R K Sundriyal',
+            ],
+            'organization' => [
+                'id' => 'H1',
+                'name' => 'Chamunda Hospital',
+            ],
+            'immunizations' => [
+                [
+                    'vaccine_name' => 'COVID-19 vaccine',
+                    'code' => '840534001',
+                    'given_date' => '2026-06-27T10:15:00+05:30',
+                ],
+                [
+                    'vaccine_name' => 'Hepatitis B vaccine',
+                    'code' => '836377005',
+                    'given_date' => '2026-06-27T10:20:00+05:30',
+                ],
+            ],
+            'certificate_pdf_base64' => base64_encode('%PDF-1.4 vaccine certificate'),
+        ];
+
+        $out = $this->factory->immunization()->generate($src);
+        $this->assertSame('ImmunizationRecord', $out['hi_type']);
+        $this->assertSame('IMMUNIZATION-9002-2026-06-27', $out['care_context_reference']);
+        $this->assertTrue((bool) ($out['validation']['valid'] ?? false));
+
+        $bundle = $out['fhir_bundle'];
+        $this->assertSame('Bundle', $bundle['resourceType']);
+        $this->assertSame('document', $bundle['type']);
+
+        $composition = $bundle['entry'][0]['resource'];
+        $this->assertSame('Composition', $composition['resourceType']);
+        $this->assertContains('https://nrces.in/ndhm/fhir/r4/StructureDefinition/ImmunizationRecord', $composition['meta']['profile']);
+        $this->assertSame('41000179103', $composition['type']['coding'][0]['code']);
+        $this->assertCount(1, $composition['section']);
+        $this->assertSame('41000179103', $composition['section'][0]['code']['coding'][0]['code']);
+
+        // Check immunization resources and certificate attachment
+        $immResources = array_values(array_filter($bundle['entry'], static fn (array $e): bool => ($e['resource']['resourceType'] ?? '') === 'Immunization'));
+        $this->assertCount(2, $immResources);
+        $this->assertSame('completed', $immResources[0]['resource']['status']);
+        $this->assertTrue($immResources[0]['resource']['primarySource']);
+
+        $docRefs = array_values(array_filter($bundle['entry'], static fn (array $e): bool => ($e['resource']['resourceType'] ?? '') === 'DocumentReference'));
+        $this->assertCount(1, $docRefs);
+        $this->assertSame('application/pdf', $docRefs[0]['resource']['content'][0]['attachment']['contentType']);
+    }
 }